Fedhealth wont pay my money back

I have been a member of Fedhealth, I terminated my membership. After terminating my membership, the credit controller responsible for the surnames starting with "M" asked me to make another payment to Fedhealth, after I terminated my membership. I comp**** as Fedhealth is an arrear contributing scheme. It turned out that the money was actually an overpayment. At beginning of July, Fedhealth sent me a statement for June and indicated that the money will be paid back to me after deducting other outstanding claims. I have been following up with both customer service and credit controller responsible for "M", and she keeps on making a promise that the payment will be made in the next payment run. This is despite the fact that on the 18th, after I followed up with her, she sent an sms stating that the payment will be made on the 25th. I just followed up with her again, she says they payment will be made on the next payment run. The credit controller responsible for "M" does as she pleases while Fedhealth fails to hold her accountable and busy telling customer that "Family takes care of family". Please be careful of Fedhealth,