Does billing know what they are doing ????

Dear MTN billing department. Please can someone do their job and sort out my problem. I wasn’t debited for June , phoned to ask why was told I had a credit. Received my invoice for July and you now want to debit my almost R4000 are you mad??? I phoned twice into the call center who are very friendly and helpful but have to keep escalating. Then I never hear back. I will reverse my debit order if MTN tries to debit as I have being trying to set this out since the beginning of the month. Please may someone phone me to sort this out or else we can organize to cancel all my contract and I’ll find service elsewhere.