bad service

this is the 2nd time i have encounter this problem with the Mr Price at the prominade centre, i bought shoes and a trouser from Mr Price Riverside mall in February and went to the prominade to return the trouser as it was not fitting. they returned the trouser but the cashier that did the refund took the orin=ginal invoice and didnt give me a copy. After a few days i wanted to wear my shoes only to find out that it was torn, i took the pshoes to riverside mal but they refused to assist as i didnt have an invoice and i understtod this and they advised me to go back to the prominade Mr Price and this that is what i did, i went to Prominade centre and the lady that assisted me previously said the she cannot go back to February documents and i should have asked for an invoice, this is bad customer service and unfair to me, i work with customers everyday and this is pathetic. i dont know the cashiers name because they dont use badges and this to me is unreasonable, she ****ed me off in front of her manager and whom is a Bongani didnt even say anything and he has poor management skills if he leaves his staff not to have badges, i am now stuck with the shoes, what do i do now. Nonkululeko