Poor service from Universal Healthcare Administrators (OMSMAF)

I have joined Old Mutual in November 2019 and was forced to change medical aid to OMSMAF, administered by Universal Healthcare Administrators. In June I received a call from Universal saying that I’m in arrears wrt contributions for November 2019 and this was due to system error. The amount due to the Fund was R3724. Then I made an arrangement with the administrator to deduct the contribution in three installments. In July, an amount of R1242 was deducted from my salary, however to my surprise an amount of R3724 is deducted from my salary in August 25th. I called the administrator and requested a refund before 30 August as I have debit order obligations that I have honor. The only response I’m getting is that the matter has been escalated to some department and will be given feedback when they respond. The urgency of this is ignored, they are inconsiderate.