I finished my contract with Tracker Last and I called them to cancel and they convinced me to atleast take a lower month to month plan and I agreed but they didn't keep their promise they kept debit the same amount, I called then several times to correc

I finished my contract with Tracker Last and I called them to cancel and they convinced me to atleast take a lower month to month plan and I agreed but they didn't keep their promise they kept debit the same amount, I called then several times to correct the issue and they promised that it is all sorted up to this day tracker keeps on debiting that extra amount. I have tried to cancell with them several time and they say the contact has been terminated only to find out that every month they keep on debiting whilst they say they have canceled it. I feel ****med now by Tracker because now it seems you can't cancel anything with them even if you have finished your contact with them, they keep debiting