Cartrack, Cartrack Bloemfontein

I cancelled my cartrack device on 9 June 2021, it was suppose to be cancelled in June after their 20 day policy and I was informed at Cartrack Bloemfontein that I still have to pay June's paymeny. I agreed, but the cancellation form was never send to their head office. I contacted Cartrack Bloemfontein again on 7July and someone else answered, she mentioned the lady who assisted me was no longer employed there. She asked for proof of my email correspondence and that she needs the copy of the cancellation form I send in June, she would send the documents to their HQ and everything will be good. This did not happen and cartrack deduct payment again, I contacted their customer service, also with struggle and they eventually send my cancellation confirmation letter on 20 July 2021. Now, according to me I cancelled the device in June and my last payment to cartrack was in June, when they took my money in July I returned it and informed my bank that I cancelled the payments to cartrack... Now they call me left, right and center claiming I still owe them for July. Excuse me? I am not going to pay for their staff's incompetence. I got an unsigned summons from their lawyers recently, if cartrack wants my R182 so badly, than I will fight to keep it as hard as possible. This is not about the money, it's about big companies taking advantage of people. I should forget about the delay they cost and just pay up?