MWeb's Accounts Department Billing Closed Account.

Early last year I received a Domains Renewal account from Mweb for a domain that had been moved to another ISP due to bad service. I.E. account was closed. The amount of R265.33 was not paid. Later in 2014 I received a letter of demand from a collection company threatening \blacklisting"should I not pay the invoice amount of R265.33 plus collection fee of R88.39. The full amount of R353.72 was paid on 1st Sept 2014 to prevent the \""blacklisting\"". Since then I have tried many times to a) Receive a letter of apology"