Bad quality is now the clients problem?????

We bought a leather handbag for my mother's birthday at the end of August, new stock that just came in at their Somerset Mall branch. After 3 weeks my mother noticed that the seals were breaking apart on all areas of the bag. on returning it to the store she was informed that she can only return for a voucher unless she has a slip???? 1stly it was a gift, why would she have a slip??? 2ndly I myself did not keep the slip as I didn't expect this quality from Woolworths??? If it was a return just to return I understand the criteria but if there is a quality issue it is absolutely ridiculous to hold a client hostage by basically saying well take another bag and if it's also bad come back again and go thru the same aggravation!!! Why??? This is completely unacceptable and I'm sorry we as a family spend 1000 of rands at Woolworths every month but I can say one thing Somerset Mall branch will never see us again!!!! The non chalant attitude from the Manager on duty is ridiculous and I'm sorry just under R2000 for a handbag is not cheap to just throw aside.