Debit Order not Refunded

I signed a 12 month contract with Virgin Active in 2016. I however moved to another location and could not carry on with it. I then wanted to join Virgin Active Middelburg in 2017. They then told me I still have an outstanding balance with them. They said I should pay the installment(monthly) which went off on 1st of June 2017, R900 and some change. Then I must come and pay R1500.00 and the other account will be settled and I can then join again for 12 months. I missed the deadline for the R1500.00 to be paid. In the meantime MBD Inc keeps phoning me and telling me that I owe Virgin Active money. I agreed to them to put a debit order of R500.00 on my account monthly to pay the outstanding off. But I lost the R900 and some change that went off on my account on the 1st of June? This is not fair? I would like feedback on this and when it will be refunded to me. I have spoken to Sofia at Middelburg Virgin Active, she has escalated it to head office numerous time with no hope. I then spoke to Riaan and he also escalated it. No one at head office comes back to me nothing. Please help! If I agreed to have the debit order with MBD Inc, I want my R900 and some change back refunded to me. Because the plan was to put the money over to the amount owed as told by Middelburg Virgin Active. I need answers please!