Trigger happy to charge customers on account

I opened an account at Queenspark last year<br> Paid in Full R911 in Sep 15<br> Get an order from RCS Collections dated 15 Dec 15 received in the post yesterday 8 Feb 16 demanding a payment of R 164.86 made up of collection fees, interest and club charges<br> Phoned RCS they said I must pay<br> They had incorrect info on my account - wrong e mail address wrong mobile nbr etc<br> must I be liable for these costs if so I WILL PAY But they have lost me as a customer over the past 15-20 years<br>