Duplicate Payment Reversal

I honestly regret opening this bank account. On the 31st a duplicate payment was made on the account while purchases at pep stores, but at pep it showed that the other payment declined and will automatically reverse straight to my account. Its been 2 week now the money has not been transferred back to my account and have been calling numerous times and sending email to standard bank with no resp. I did everything i was asked even pep stores called the customer service to advise them to reverse that payment. This bank is making my life a living hell..Please Please help this is my transport fee