Very bad service

I have a contract with MTN since 2017 , i lost my job and i couldnt pay, therefore i got a job early this year and i made arrangements with Norton attorneys to make installments so i can pay And i made payments, then July i got notified by norton attorneys that my account has been moved by MTN, i had to call MTN and i was notified that yes indeed my account was moved to Saya attorneys without any communication, so i made a payment to Saya ( July) , after making the payment i called MTN to confirm if they received my payment and they said that my account was moved back to Norton attorneys, its very stressful because i dont know why they keep on moving my account without any communication and they charge for all this, i called MTN last week and they gave me a reference number (*** ) they promised to call me back and they never did , i called them yesterday and i asked for the supervisor (Sydney) he said he will call me back but he never did.

I dont know what to do anymore because i realy want to settle this account as it is preventing me from getting a job i studied for.