Why i can't cancel my subscription even after i fully succes pay all the billing??!!!

Adopt keep saying there is a problem with the billing, and need to resolved it first. even though i already fully completed pay the billing. it makes me cant cancel my subscription. i need to refund my money because i am not use this app often.

It looks like this app make you cant cancel your subscription by keep saying there is a billing issue and need to resolved it first.  please tell me how can i cancel my subscription?