Handed over

I have cancelled my subscription with them because i moved from a house to a townhouse,i have sent them a letter of cancellation,phoned them and they told me they received the request and that they will sent me a form to fill in and send back,i did so phoned again asked them if they received it,they confirmed the letter of cancellation,now 2 years later i get a email that i owe them more R7000,they did phone me a while ago also the same story i owe them money so j spoke to the lady and send al the cancellation information through i never heard of them again until now,now they said they handed me over to take it further,and also the amount is higher than before,so meaning there was no cancellation on the 2 properties that i have cancelled