One Plan insurance are ********** and rude

I had a health insurance with one plan. I had a day to day plan for a dentist so I had to go to the dentist and after several attempts of trying to load my funds on my card and getting an error message.,I call them to enquire, I get told that I had reached my yearly limit to visit the dentist or any kind of a doctor. Which is nonsense by the way. But then I decide I have hadone it with One Plan son I decide to stop all, debit orders. They immediately suspend my cover and I'm fine with that. Anyway thus month I check my debits and there shows up one plan deducting for 2 months. I'm not sure which two months since they suspended my cover immediately after I reversed their debit orider since October of 2019. I would like one plan to stop debating my account for a cover that has been suspended. Those guys are **********