Many shops today ask the buyer for a lot of personal information
Legal advice from Vakilsearch.com
Giving personal contact details to the seller:
You should not be compelled to give your personal contact details to a seller in an ordinary purchase.
If you are compelled to do so, just walk away and do not complete the transaction. Ordinary information, like your credit card information and contact details, may be asked for to authenticate payment. But in most cases, your personal contact information should not be asked for. It definitely should not be made compulsory.
However experienced or famous a lawyer is, his or her advice will always be coloured by personal prejudices. So it is advisable to take this into consideration before taking a decision based on legal advice from external sources. Many business people take advice from at least 2 lawyers.
Finding a good lawyer can be difficult and to solve this problem, there are websites which offer legal assistance online. A user can pay for each question for which he or she asks legal advice or can prepay for getting a certain number of queries answered in advance. Each question is forwarded to the relevant expert on their panel of lawyers, who then formulates a reply which is sent to the user within a specified time frame.
From http://www.lectlaw.com/def/c095.htm
Refers to a situation when someone, such as a lawyer or public official, has competing professional or personal obligations or personal or financial interests that would make it difficult to fulfill his duties fairly.
Many government organisations outsource their work to private firms and there is often a conflict of interests, when the private firm misuses the powers and information they have to further their own interest.

law of defamation & malicious prosecution
The book on the law of defamation and malicious prosecution by V . Mitter is fairly comprehensive with details of complaints and defences. It explains the difference in English and Indian law, civil remedy, libel and slander. This book is very popular, the first edition was published in 1954 and the latest edition , published in 2008 (and reprinted in 2009) is revised by Justice K . Shanmukham, Former Judge, Madras High Court. The detailed contents make it is easy to refer to a particular section and check the legal definition. An easy read even if you do not have a legal background.
Publisher : Universal Law Publishing Co.
Preparing and sending a legal notice
You can draft the notice yourself or avail the services of a lawyer.
The notice should be addressed to the person or company against whom you have the grievance.
The notice should include the cause that compelled you to send the notice.
It should also mention prior communication with the recipient regarding the cause of notice.
Offer the recipient a reasonable time say 30 days or 60 days to settle the matter by negotiating and by performing the desired action.
Specify the time in the notice for either fulfillment of your demand or giving reply
Sent it through Registered AD post or any other trackable method. Keep a copy of receipt of post office as well as notice.
You can send personally send the legal notice without lawyer but it is advisable to ensure that you draft the notice meticulously, in such a way that it is not too long but still contains all the material relevant to the dispute.