Reserve fund payout

I HAVE BEEN RETRENCHED BY MY EMPLOYER AT THE END OF MARCH 2015 AND ALONG WITH THAT, I CLEARED ALL MY ACCOUNTS WITH IEMAS AND COMPLETE THE NECESSARY DOCUMENTS TO TERMINATE MY MEMBERSHIP. THE AMOUNT AT THAT STAGE IN MY RESERVE FUND ACCOUNT WAS DEDUCTED FROM MY IEMAS DEBT AND I PAID THE BALANCE WITH MY RETRENCHMENT PAYOUT. AS IT IS IEMAS'S YEAR END IN AUGUST, I ONLY RECEIVED RESERVE FUND FIGURES UP TO AUGUST. AS I ONLY TERMINATE MY MEMBERSHIP IN MARCH 2015, RESERVE FUND MONEY FOR THE PERIOD SEP 2014 UNTIL MARCH 2015 WAS STILL DUE TO ME AND I WAS PROMPTED TO COMPLETE DOCUMENTS AGAIN, WHICH I DID ON 2 DEC 2015 AND I WAS TOLD THAT I WILL RECEIVE MY BALANCE PAYOUT IN JANUARY 2016. I FOLLOWED UP TODAY, 5 FEB 2016, AND WAS TOLD THAT I WILL ONLY RECEIVE MY PAYOUT IN MAY THIS YEAR, WHICH IS UNACCEPTABLE TO ME, BECAUSE I WAS TOLD THAT I WILL ONLY RECEIVE THE BALANCE WITHOUT ANY INTEREST IN MAY. IT LOOKS LIKE IEMAS POCKET THE INTEREST RECEIVED AND THE MEMBERS MUST JUST ACCEPT IT LIKE THAT. PLEASE ASSIST.