Poor service/ customer experience

my daughter had a birthday last week and happaned to be gifted with the same pyjamas and gowns twice from Mr Price. so i went to Mr Price westgate in attempt for them to exchange for me and amybe give me a different colour of the gown and PJ's as i already got the same thing twice. When i got there they refused to exchange or even hear me out they asked for the slip and i told them i do not have and while still explaining the lady just said the law is the law i need a slip or no exchange but what law is this ? other shops are where i had the similar problem were able to assist i fail to understand why Mr Price has such poor service. then another lame excuse of the looting came out i mean lets be honest did Mr Price have the same range last year July when the looting happened why are we still using that as an excuse? is this the kind if service you give to your customers? is this how you potray your business. i am utterly dissapointed and still have 2 of the same things at home. can i be assisted please !!!!!!