No human staff at MTN call center

I have a contract with MTN and recently upgraded. They **** to me in-store saying I can't up grade as it is a month to early I would need to take out a new contract then just phone in a month later ro cancel the otherr I am now paying 2 contracts it seems and can not get hold of anyone to rectify this problem I have been phoning daily and just can not seem to speak to a human mtn does not care about their customers I just want someone to phone me so we can sort out my account