BAD CUSTOMER SERVICE WITH ADT FIDELITY SECURE DRIVE

I had a contract with ADT FIDELITY SECURE DRIVE. for tracking devise in my cars. our agreement was to pay R130 per month on each car. i have two cars. the amount per month was supposed to be R260 per month for both cars. we have agreed that the deduction must be through a debit order on the 15th day of every month. they deducted the agreed amount on the 15th of every month for few months. from then they stop deducting through debit order. they never contacted me. after few months they changed the amount of the premium and increase to different amount every month. they decide to change the date of deducting a monthly premium to any date. eg, the 07th, the 1st and any date with any amount. i tried to call them several times to sort out the matter. i was transferred from one line to another. i didn't get hold of anyone. this year i get several calls and massages from lawyers demanding payment of R3000. i told them i do not have that money. is above my budget. and it was not my fault that ADT did not stick to our agreement of deducting R260 through debit order on the 15th day of every months. now i am blacklisted with default at ITC through this company. I am being harased by collection attorneys. but ADT has never contacted me to sort out the matter before handing over my account and listing me on default at ITC. I regret everything i did with this company