Terrible service from MTN

I did an upgrade on my phone in April this year.My account was being paid at the end of each month via debit order.When I did the upgrade the lady struggled to get a debit order or something to work,so she said I should pay my account and then get a debit order done thereafter.So I paid on the 02/05 for my April account,and on the 27 May I paid for the May account.I received an SMS to my surprise,to state that I am in arrears with R738,02.I then phoned MTN,who wanted to speak to my husband in who's name the account is-even though it is my cellphone and he has no clue what is hapening with my phone,in fact,he does not even know my number.I tried explaining that to the lady,but she wanted to speak to him,which is almost impossible because he is at work and not with me most of the time.Then on 22 nd June I received an sms staing that my outgoing calls have been suspended because of non-payment.Which is quite unreasonable,what if I had an emergency and can not call.I then phoned from my husbands phone after work,the lady did not want to help me.Told me my husband should phone her,after speaking to him she agreed to help.I explained everything,then she said they are making a payment arangement-what for I still dont know.The 23rd I went to MTN in Secunda,where the lady told me she can't help me,I have to phone MTN.But she said the one who upgraded my number made the account run from 17-17 of each month-no one told me that,and it is stupid because we get our salary on 28 each month.I would like an apology from MTN,and for them to change my payment date back to 29each month.Now I am apparently owing money because of someone making a mistake.So I sit with a bad name because it looks like I did not pay,even though I did.They must explain to me where the R738,02 is coming from that I appently owe,and also change the account holders name.They are not responding to my email that I wrote on 20 June.This is really pathetic!!!!!