Awuful customer services

Hi. I have a contract with mtn which I app**** for via mondo which is the 3rd party. I have had the phone for 2months the phone suddenly curved backwards in the middle and back cover is opening. This a huawei p30lite I don’t know what might have happened to the phone since I don’t use it. I went to mtn in gateway the first consultant said bring my id book so they can send it back it’s a factory defect , came back with my id second consultant just told me straight it’s not a factory default it’s physical damage they will not cover it , without asking any questions to assess what might have happened. The phones screen is working fine but phone is opening which I find very difficult to believe it’s my fault as the consultant Imp****. It will be booked in as a non warranty .he ddnt not care , he was very impatient he was on his phone half the time , I sat there for 1hr just to book the fone in , and I am appalled by the kind of service. And then he tells me it’s 3rd party so they don’t deal with it, how becz the phone came from mtn and I am paying mtn . I will not let this go.