Threatened to be taken to court for breach of contract that has since expired and account still billed.

I had two tracker contracts one from 2014 and 2015 which was for 3 years. The contract for 2014 expired in 2017 and they confirmed it also and to my knowledge, the company should've stopped debiting my account. They continued debiting my account for several months after which has to call them in February 2018 and told them to stop debiting my account and reverse the debt order collected after the expiry date. I spoke to one of their agent who was not well versed with the query and gave me vague excuses saying the policy is agreeing with them to continue debiting the account to my knowledge it was the first time of hearing of such policy or received after installation and so he promised to notify his superior / manager to contact me back shortly and until today still to rectify the problem, until today there is no response received again sent him an follow up email as to whether they have canceled the contracts again did not receive a correspondence. so every time they continue to debit my account with the higher amount of R 597.00 considering they merged the account of the two cars of which one was only left with one debit order to go through. I keep on reversing the debit order which it cost me R18 per transaction. the previous debit order for each car was R 169 cyber sleuth Currently am being threatened to be taken to court for breach of contract in regards to the contracts that expired and no one advised me about the continuation condition maybe I want to change the product and also they did not do courtesy call as to see whether am happy with product, During those 3 years there were incidents that should have triggered them to call me and check me . I don't even need an explanation from Altech Netstar, I need my premiums from the day my contract expired to date paid back. and for them to stop debiting my account with different references. According to me, they breached the contract.