Eight rules to follow when returning goods
1. Be hasty
Don't delay returning a faulty item or reporting a loss of service.
2. Receipts
Be sure to retain receipts as proof of purchase.
3. Log your complaint
Keep a diary of your complaints, including names, times and details.
4. Know the law
Mug up on laws such as the Sales of Goods Acts; the Misrepresentation Act 1967; Misleading Prices - Consumer Protection Act 1987, and Section 75 of the Consumer Credit Act. These may protect you or help you get your money back.
5. Keep calm
When returning goods always make sure you are assertive, but remember to remain polite and patient.
6. Go to the top
Take your complaint to the top of the firm - or, if necessesary, to an ombudsman service, if there is one.
7. Small Claims Court
If all else fails, try the Small Claims Court. The maximum you can claim is £5,000 for England and Wales, £3,000 for Scotland and £2,000 for Northern Ireland. Find out more at adviceguide.org.uk
8. Seek advice
If you require any further assistance or general advice visit consumerdirect.gov.uk and citizenadvice.org.uk

can you please advise me why shops only give you half the price you paid if you do not have the receipt. this is very frustrating as prices change so quickly that each time this has happened i end up only receiving half the price i paid previously. is there anything i can do if shops tell me this? thank you
the most used weapon against anyone making a complaint is the time factor i.e they will delay you and get you running around to wear you and your patience down until you eventually give up , i have yet to see any advise to combat this. this has been used against myself time and time again