Bankful Native

I was first told to download/use Bankful as our site was trying to sell CBD lotions and creams. I set up our account, and was then told to setup another account with Square to process the transactions.. that Bankful was essentially the "middleman." ... after several months of my sales declining because the user-friendliness of checkout was severely diminished, I tried Bankful Native. It still didn't work. I ended up canceling Bankful (or so I thought). Now after 3-4 months from initiating that cancellation I still cannot delete the app from Shopify, and I can't seem to get anyone online to help me cancel and I've been charged $50/mo for the service I cannot use. To say I am dissatisfied is an understatement. Please cancel my account and refund my unused service fees!!!!!