Suspended my account after debiting

On the 11th of March I received my invoice with an average spent amount of R135.49 but my total amount was R0.08 on the invoice. On the 5th of April an amount of R189.00 was debit from my account. On the 31st of March the exact same amount of R344.93 that was debited in February was debited again, which I reversed because there is no way in hell I could pay twice. On the 7th I received an email that I didnt pay the amount of R344.93. I really dont know where that amount is coming from and that same night they suspended my account. I tried to call but couldnt get through. Yesterday I've sent a message on messenger than only they responded and said I should reboot my phone my account is active again. I rebooted my phone and here I am today. My account is still suspended I cant make any calls nothing. I told them that it is still suspended and I was advised to use my sim in another device. How the hell do you use a sim in another device if it was suspended????? No wonder you lose so many clients. Even with your billing of your data. Everyone is complaining about MTN and now I can see why. I'm done with MTN after this. Once this contract ends now. Please cancel it... I want my account to be activated today still!!!!!!!!!!!!!