Wonga blocked me

I am very disappointed by the service i got from wonga... April of this year a requested for a loan and paid for it before the due date. However the debit the account even though i made a payment. I then requested for a refund and they told me that it will be in within 24hrs. 24hrs passed without any refund. I reversed my payment and later that night they refunded me, and I paid it back. Now they have blocked me for future request when the problem was on their side. Totally unacceptable.