Double debit on my account old contract not canceled 😡😡😡😡

Im not happy with tracker service, my account has been over overcharged despite me calling numerous times to cancel my old contract and migrate to a new one. I was informed that there will not be any extra charges because im still continuing with tracker, i will just pay a pro-rata and the new contract fees. I need someone to explain why R700 was debited from my account instead of R349

I called numerous times telling them that on my app I'm still seeing 2 cars and they have not removed the old car and they reassured me that I only have one contract and their voice records can prove what I'm saying. I'm so angry because I've been wasting airtime calling these people but it seems like they don't know what they are doing.