Wrong amount processed at medical aid.

I have been waiting for a doctors account from the 9th of April to be reimbursed and still it hasn't been done. The captured the wrong amount and I have had to phone several times to have it corrected. The last time was on the 7th of May. I phoned again today and they said that it would be reprocessed only by the end of the week. There repayments are not even half of the amount charged and they cannot even get that right. I would change any day to another medical aid but they are probably all the same. I need to get the account finalized so I can send the short fall to my insurance gap. this is completely unacceptable. Anyone you talk just sounds like they bored and half asleep.