Accounts error after sending proof of payment twice

<p>When i tried to cancel my Cell C contract i was told i would need to transfer an amount of R1424.87, i did this and sent proof of payment, a month later i got a statment that did not reflect this amount that i paid so i phoned in and again had to send prrof of payment and was told it had been sorted out. today i have been debited for the full amount. this is totally unaccaptable. </p>