Contract declared void but not getting my money back as promised

I was called by modo for two "upgrades" on existing contracts, when the contract was supposed to start I didn't find the data on my phone, when I phoned vodacom they said that it was new contracts that was given to me. I phoned modo and they launched an investigation and declared the contract void and said they will pay the money back that was paid by me. The contract started October 2017. I phoned them when they told me that and they asked if I would like the have the contract a reduced rate and I told them no. The contracts is still deducted from me every month and when I phoned them again they said they were waiting for vodacom. When I phoned vodacom they said they were can't do anything it must come from mondo. Its been 4 months and nothing has happened except that they deduct at a reduced rate which I told them I don't want. When I try to phone them I must hold on for more than half and hour and I feel that I don't need to phone them to get my money back, according to me, they should have stopped the contracts when the investigation was conducted. I have a reference number:5770.