What you do after you buy can be as important as what you do before you Buy:
Save all papers that you get with your purchase. Keep all contracts, sales receipts, manuals and warranty documents.
Ensure that the Warranty card is stamped with the seal of the Service provider, date of purchase, term of warranty period. Any card without these details renders the warranty null and void.
Read and follow product and service instructions. The way you use or take care of a product might affect your warranty rights.

Important Consumer Tips 
To protect your money and avoid being a victim of fraud, keep these things in mind:
A deal that sounds too good to be true usually is! Offers that often fall into this category are promises to fix your credit problems, business/job opportunities, risk free investments, and free travel.
Think twice before sharing personal information. Protect your privacy and avoid unauthorized use of your personal information.
In case of a problem …
If you happen to encounter a problem on purchase of a product or service, this is what you should do:
Find out who is responsible for the problem
Collect the name and address of the dealer/seller and the manufacturer
Document your complaint – write letters of complaint to the shop manager / Dealer / Manufacturer / Service Provider clearly stating:
The nature of your problem.
Evidence of having purchased goods or services to be provided.
The relief claimed – repair / replacement / refund / compensation.
A deadline for replying.
Send the letter by registered post with acknowledgement due.
Always insist on a written reply from the opposite party.
Where applicable, after expiry of deadline you must notify the concerned authorities / government department.
Immediately initiate action to protect your rights. You could contact a local consumer group for help in doing this, if necessary.
If you have taken legal action, publicize the result, so that others gain awareness from your experience.
Important Tips for Consumers
Read the fine print.
Insist all claims, promises and warranties be in writing.
Never sign anything you have not read and understand.
Never give your credit card number over the phone.
Keep receipts and Warranty cards.
Always ask about return policies.
Always keep credit card receipts.
Do not sign blank credit card receipts.
Sign credit cards in ink as soon as you receive them.
Never leave credit cards lying around.