Good day Ubonwan and please accept my sincere apology in the lateness in replying. It seems there was confusion on processing the refund; as you have indicated a different amount than what is available and therefore this has caused a delay in the funds being sent.
Since the refund has not yet been processed, would you agree to have the one past due invoice of $13.00 USD deducted from the available credit amount of $601.25 USD? If so, the refund would be in the amount of $588.25 and your account will become current and up-to-date until 11/12.
If you could please let me know just ASAP if you approve of the above or not, I greatly would appreciate it!
Thank you in advance for your kind attention!