Cellphone return

A Samsung J7 was purchased on 29th oct. Was given to me on 12th nov as a bday gift. Wasnt happy with it as it is huge & doesnt fit in my pocket & i hardly carry a handbag. Took it back to makro to exchange it. They took it in for accessment as it was over 7 days. 2wks later they fone me to say that i must pick up my fone as they cannot change it. I spoke to sadi (gen merch manager) She tld me that there is no way they can change it. I foned head office on 21dec. No1 got back to me. Logged 2 online complaints & still wasnt contacted. Today i fone back to head office( ********** 999) spoke to madu & she said she had no idea wat my complaint was about & cant help me. I then got thru to joburg offices ( ********** 009) spoke to khgu. After consulting with sum1 else he informed me that there is no way any1 can change my fone. So nw im stuck with a fone that of no use to me.