useless non-transparent borderline thieving

I own a fleet of 26 bikes I have had 8 bikes ******, none of which have been recovered, they weren't even able to get a signal response from any of the bikes. I requested to cancel the service, they then took more than a month to get it done while I continually had to remind everyone to do it, they have a cancellations fee which is calculated as a % of the remaining 3year contract, which I knew since I had read the contracts. But none of the people that I communicated with knew that, they only knew that the system calculated it and did not know how much it should be. I queried them about the amount as the cancellation fee remained the same month over month and they could not explain to me why . They forwarded the amount that I would have to pay to settle the contract, first they said it would be R9 223.50 after a month passed and I paid another R2600 for that month (they took more than a month to get the cancellation done) I requested the updated figure, then it was still R9 223.50 . I then continually pressured them to correctly calculate it, then they shared a new figure, R8 649.82. They then finally got the cancellation through but at the end of the month the debit order went off for R12 571.00 . I am still in the process to try and get my money back but I still haven't managed. So, overall, terribly unimpressed