Breach of contract

I am so surprised about this company's ill perfomance. I upgraded from a Compact DSTV to a Pricelock Explora in November 2016. I expected the changes to be effected beginning of December. To my surprise, my bank account was being debited with the old contract amount. I do not usually check my debits exactly how much is going out since I am very busy person. But I knew that my account was being debited by Multi-Choice every month. After 6 months services were discontinued reason given was that I hadn't been paying since Nov 2016. I was asked to produce POP, which I had to ask for a 6 months banking statement of which I had to pay for each page. They told me that the money all this time had not been going to my account, how that happened I don't know. After some time the money was recovered back to my account. This has caused me a lot of inconvenience and broken services. Now they are telling me that I am owing more than R3000 from the difference of the Compact DSTV and Pricelock Expora. I refuse to take responsibity for their mistakes. My responsibility after signing a contract is to make sure that the money is available in the bank and them to deduct the amount signed for, not for me to check if they are doing their job. Its been more than 2 months my services discontinued and they do not even care, I believe because they have no competition, they know that I cannot go and seek services somewhere else. They are refusing my request to discontinue this contract as they breached it and start a new one. The communication channels is very poor, I have sent emails that are not being rep**** and made phone calls and told that the matter will be escalated until I phone again. I am very traumatized by this company. I want to know if there is anybody who has had a similar experience. BV