MTN call centre agent's are useless

I have been trying to get assistance with my contract with MTN for almost 3 weeks now. My credit status says that I am in default and that I am owing R2k but my account and statement is actually R0. This is affecting my credit history and I would like it to be fixed. The call centre agents keeps sending me from pillar to post and coming up with excuses like 'we are busy migrating that's why we are unable to assist you'. This is ridiculous and someone senior needs to resolve this as it's seriously putting me at a disadvantaged position.