damaged goods/shoes..money back ?

[tatu]

i dont know what my consumer rights are but i bought a pair of shoes 3 weeks ago,,the sole is coming off,,,the girl in shoe shop says to leave them and they will fix them ,,,am i not entitled to change them for ones the same price ? or get my money back ?..it says on reciept that goods returned within 28 days and in a good re saleable order will get refund