Issue cancelling tastecard

I signed up to Tastecard at the end of last year, probably because of a deal on here, however I just tried to cancel it as my 2 months is nearly up but I just keep getting a "something went wrong..." message.

I've contacted customer support but has anyone else been having issues too?

I've no idea if I had to give them any bank details, but I can't see anything like that on their website.