Taking more money from me than what I have signed up for

Supersonic is taking more money from me than what I have signed up for. From R845 to R2115 - that is excessive!!! I have phoned in numerous times to get this sorted. With no luck! I am having to reverse the debit order with my bank. Which is costing me money to do because supersonic will not help me to sort my invoice issues out on my account. I have tried to call in over 5 times. Each call center agent keeps putting me on hold for long period of time (up to 30 mins). Getting hold of call center is impossible. Now after 40 minutes of being on hold again I eventually gave up and am now writing this review. I have also made an EFT payment for the correct amount because I don't want to go overdue on my payment. I don't know who else to call. I have also tried sending supersonic emails to assist me with this but I just get no response. Why is it so hard to get assistance.