Lewis i need my money please

I have been paying for my hifi in Lewis store of PE branch via stop order and then i settled the account before time but unfortunately for me i forgot to remove the R500 stop order and the money still went off now. I tried calling my branch and its 2weeks now being told someone will get back to me...m dissapointed that it could take so long to sort out such a small issue...its even worse they agree that they see the money on my account but its hard to pay it back to me and when i was still paying i was getting charged alot of interest if i miss a payment...maybe i must also starting charging interest every day my money being with them