MTM and Mondo

I was called by Mondo with a contract of R299.00 20GB R139.00 airtime dual Sim, when phone arrived was not dual and I told the consultant I can only afford it in March die to finance, she said the special will be expired by then but she will send the phone and I will be Billed March, I agreed to that phone came in January and I was not happy with the phone not being a dual phone I took the phone back to Vangate mall MTM, I emailed MTM and called Mondo and cancelled the contract in January, Feb. They deducted R591.03 from my account without my permission because I cancelled the contract, March they left my account in a minus, I get disability grant they took my policy money they keep on promising to refund my money it's April already I'm still waiting, MTM send me my next bill I keep on telling them I got no phone or contract with them but the just keep on deducting I tell them I got reference numbers to prove the cancellation but it falls on deaf ears. But I'm going legal aid with them they unprofessional