Worst costumerservice ever!

Worst client service I have ever experienced! Cant believe that Im going through this, seeing that Im using Samsung phone since forever! Took out a contract with Mtn end of Nov last year and beginning of March the phone battery started getting extremely hot and runs out in an hours time without use. Took the phone back to Mtn in March and told them about the problem and said that Im not prepared for them to work on the phone, seeing that its stil new and under the 6 months gaurantee. They check the battery at Mtn, told me to clean the phone and bring it back with all the accesories that came with it. Myself and the guy at Mtn checked the phone for any scratches and there were nothong on the phone. Phone was bubblewrap and send to Samsung repair centre WeFix. Toy dis belief my phone came back and I was told it cant be exchange because of the came glass jas a crack through amd chips on it. Things that wasnt there when the phone was send off. So now it seems like nobody want to take the blame for damaging the camera and Im the 1 paying a phone for 8 months already now that going nack and forth between Mtn, Wefix and Samsung! So what do I do know! Seriously Im being punished now for something I have nothing to do with. I want that phone exchamge asap! Cant believe that a big company as Samsung is this *************!