Terrible Customer service

I paid the installment on my account at the end of May using Zapper, few days ago I received an SMS saying that my account has been frozen due to it being in arrears. Phoned MRPMoney they told me I need to email the POP, I did as well as emailed Zapper to see whether the problem might be on their side (Everything is fine on Zapper's side). Spoke to MRPMoney twice again over the phone to find out whether the matter has been resolved. Still no reply on the email and the matter has still not been resolved. Strongly considering closing my account as this is unacceptable.