Trouble to end Contract

My contract expired in April already, but still they deducted R171.50. After 3 x months I was told I must phone in to cancel the contract, which I did and was told because I should have called 3 x months in advance, they now going to deduct until end of November. I reluctantly agree to this. On the end of December the deduction still continued. To think that I wanted to take a new contract out on a laptop with these people.?!.. I JUST WANT THIS **************** TO STOP, AND MY MONEY TO BE PAID BACK INTO MY ACCOUNT!!! And it is no use phoning there call centre, because the ******* people just don't pick up, and if they do, they put you on hold for the rest of the day.