Shocking Service....

I was called by the Vodacom collections department last year Dec - 14 demanding that I pay the R5,500.00 odd for subscription costs I owed, I was totally surprised as in the past 2-3 years I had my contract with them I had never paid more than R500.00, and my contract had expired and was running on a month to month agreement, until I renewed or cancelled it, however knowing that I had not cancelled it, I agree to pay under protest, and I issued an instruction to cancel the contract thereafter, this to my surprise that in April this year I was called again by the same department and this time I owed R5,742.98, and this time I refused and told them I had previously cancelled the contract after having paid the similar cost and requested that they send me the breakdown of those costs so that I can make a follow up and investigate this myself, and to my surprise I was told to visit Vodacom, but surely if they are Vodacom it doesn't make sense to drop the call and drive to town, stand in the cue if they had the guts to call me to demand money they don't even have the details for. I told them I don't have the time to do that, and they must be able to send me those details before I can pay