NO SERVICE AT MTN

MTN have no customer service at all. I upgraded in December 2020 to a cheaper bundle. We have 2 numbers on my account. They have loaded over R600 worth of "airtime"on my one account and nobody at the MTN shops can explain to me what it is, why its there. I been to the Centurion Mall MTN store many many times. On 3 April they logged a complaint and I have since not here one word from MTN, but my accounts have been suspended. According to the assistant that helped us upgrade the combined monthly payment should be R980 now we must pay R1900, I also paid for the first month R2750 . When I went to MTN Centurion mall today they said I must pay R 4000 to re open my accounts. Still nobody instore can tell me what I am paying for. Standard answer sorry we cannot help you.