Irrate, annoyed, disappointed, over billed, unhappy

For the past 2 months, MTN bills me more then the invoice they send to me. I called this morning to query this, spoke to Itumeleng, Boitumelo and call cut, spoke to Mbali she was not of any assistance to me, i even ask to speak to a manager and she was like in which manager. Service receiving from MTN is very poor, I'm disgusted. There are a lot of things that does not make sense to me, 1st my account use to go on the 25th of every month and since last month it goes off on the 27th, there is a reason why a person sets a specific date for debit orders. A contract was taken out on my name and it was specifically stated that it should go off my husbands account, now Mbali is telling me to go back to the store, i am not willing to that, due to C19 you have to stand in long queues as only 2 people allowed in the store. I am so frustrated. She also explained about spend limit, I know this is a top up account and every time my minutes are finish I buy, she told me that she will arrange to set limit for R0.00 - just got an sms limit set to R800 - why is MTN so ***********, clearly they fail to carry out an instruction, cause if it was set from the onset that the 083 no should be debit from my husband's account as all details were given that the money was not gonna be deducted from my account. Who change my debit order date? I'm so annoyed, will definitely not renew both contracts. I need you to find the application form and my main query is why you bill me more than the invoice receive. I need this to be rectified. People must start doing they jobs and not bill a person just as they wish. Very disappointed client.