Complaint for jet store gugulethu mall

Today at 13:00 I went to a jet store at gugulethu mall to purchase pyjamas for my mom because she is in hospital. Only to find out when I'm at the hospital the pyjama sweater fits correctly but the pants are small. So I went back to the store for a pants exchange with till slip. The security guard at the store said I should proceed with the exchange so I go to the till to exchange but the cashier tells me that they do not do pyjama exchanges. So I requested to speak to the the manager by the name of Paul Sidu he said that there is nothing he can do because the company policy says that they do not change pyjamas so I asked him is there anything he can do? He said no ! With attitude but I tried explaining to him that I was not told that they do not do pyjama excchanges at the point of purchase he left me there hanging I'm sitting with a new pair of pyjamas and I honestly don't know what to do I am very unhappy with everything and I am unemployed to purchase a new pyjama he had lack of everything for a customer I am very dissapointed