Angry, unsatisfied customer

On the 11 of March this year I was involved in an accident around 01:00 in the morning, then the tracker company called me to ask what was happening because they received an alert. I told them that I was in an accident. I then bought another car since the insurance did write off the car. but to my surprise the tracker debited money for the device that I don't have in my now new car, I sent them an email explaining that I need them to install that tracker in my car since I am still paying for it but I later got an email from them showing me how much must I pay for settlement and I further explained that I didn't want to cancel the contract with them but to get the device from a damaged car into the one I am driving now, then they didn't even respond to my email. When they debit month end I went and reverse the money because I still didn't have the device but was busy paying. Last week I gave them a call and at first I wanted to cancel but after the lady explained to me that the contract is valid until September 2020 I then ask her not to cancel but to please put the device in my car. I was told that I must pay R600+ for courier because the damaged car is now in Cape Town, I didn't have a problem with that but they then said I owe them R360+ for the two months I reversed the premium, I asked the lady to put the two payments as part of the contract which means now the contract will end on November, that is when the lady said she will send someone relevant the email asking her to call me and make arrangements on that but today (20/08/19) I received a call from Boitumelo Molemo( netstar employee) asking me when will I pay the R360, when I try to explain to him, he then caught an attitude and told me he can't listen to me because he wants tell other people as if I didn't have a serious issue with them. I have a recording of his phone call and the ill-treatment is clear on this call. Netstar only care about how a pay them but they don't want to address the issue of how and when do I get the device installed in my car. Boitumelo gave me a worse attitude and it must be addressed, please help me