ZERO CREDIT CARD RUNS UP 1,5c PER MONTH!!!

I have a Nedbank Platinum Credit Card.... <br> <br> I ONLY use it for ONLINCE purchases, and when the purchase is made, I immediately transfer the funds from my cheque account to the credit card account and settle the debt...<br> <br> Last time I used the card was in MARCH 2015, and it was cleared immediately as all other transactions. <br> <br> Every month I see this credit card account run 1,5c in debt, and up to now its 16c in the RED.... with NO ACTIVITY ON THIS ACCOUNT!!!<br> <br> I queried this with my \personal relationship banker"as well as with an email to the local PE branch..... and it still runs up 1"