Useless as Usual

My monthly 2Gb data got cut off in February.I was told I owe R3500.Apparently I had accumulated this bill since May 2014.I didn't receive messages as this is to my data device & not my phone.I didn't receive statements every month either.I now have an email trail since February for someone to help me migrate my package but to this day no one has helped me.I settled the account by April 2015.I contacted MTN end April regarding migration and was told she couldn't help I must go in store.I then queried my balance and was told I had credit on this account of R28.The very next Monday I contacted MTN to cancel my account and then queried it again to which I'm told I now owe R2500!!So I accumulate a bill from May 2014 - February 2015 on my 2Gb package of R3500 but in one little month I accumulate R2500!?To make matters worse I have been phoning your lousy call centre since Monday last week for an itemised bill which was promised 2-24 hours later.Nothing.Apparently problem in billings as I don't have itemised billing on my contract so it will take time(to fabricate?)That is nonsense.Last year there was ***** on my account so this seems fishy.Now my 4 calls this morning are being dropped?