Deductions & Misleading App

Firstly tracker called me last yr trying to sell their product call tracker guide, I told the guy who called me to call after 5pm cos I had to discuss it with my wife, that was the last time we spoke, to my surprise on the 19th of October pro -rata was deducted from my account. When I tried to talk to them they insisted that I agreed to buy the product, I requested the recording of the call, nothing to date. Recently they said I'm owing them +/-R850 for their SMS notification services, I also tried to dispute and I failed, the said should my vehicle get stollen they won't assist me, I had to make an arrangement & pay that amount which was agreed that it'll be splitter into 3 instalmens. 1st instalmens was deposited on the 9th of March this year, on the 17th of March I received an email saying amount due is R694.12 , on the 25th of March I deposited R199 for monthly subscription, on the 31 of March I received an SMS thanking me for paying my Acc. Today the 8th of April I received a shocking SMS saying I'm owing R1833.6 . Someone please assist this is unacceptable and disgusting. These people haven't reimbursed me the amount they ********ly deducted for the product I didn't agree to. Lastly their App is 20% accurate, I reported that as well they said if it's technical fault I'll be liable for the amount +/-R600 that was few days after their unit was inspected & I was told that it's fault free.