No response on global number

i have been trying to get hold of MTN number to find out what is going on with my account that is R500 more than usual, i have counted, i have been on hold to talk to someone every day since last week the 2nd 3 times a day for 40minutes at a time, it just cuts off after 40minutes, i can not log onto my account on the internet it wont log in and apparently you can only talk to someone on the *** number. all i want is to ask some one what is going on with the account and to reset my log in details...