Very poor service

I had an RCS coricraft card which I settled in February 2016. I requested the account to be closed afterwards and was informed on 14 February 2016 that the request to close had been forwarded to the relevant department. This week while applying for credit, it was brought to my attention that the account appears as active on my credit record. I was asked to get proof it was inactive. I then called RCS to request a letter on 20 Nov(ref: ********** 01055). I was informed I would receive the letter within 24-48 hours. When I had not received the letter after 48 hours I called again and was told I would have it by end of business 22 Nov(ref: ********** 01878). Needless to say, the letter never came. I’ve also sent an email to the RCS coricraft group on the 21st, with my card number enclosed. And instead of being given the letter, I was asked to provide my card number again. How ****ty can one company be at customer service?