Glad to see you've joined the ranks of registered users!
Your posts certainly conveyed your frustration with the situation, and I understand; billing errors can be a very sensitive issue.
I'm glad to hear you've been able to contact the billing department, and the result was a credit being applied. That said, with the issues you had the first time around, I would be happy to extend myself (or Cogeco_Joni), to review your account and ensure the credit is pending. All I would need is a PM with the Service Address.