Communication Breakdown

I am a client with Consumer Wise,I dealth with 4 different people whom they give me 4 different answers.In December a lady by the name of Linda was suppose to send me my Clarence Certificate but she went on leave without sending it. Then I called their other branch in Germiston and couldn't be helped because Linda is on leave. Then yesterday the 2nd I called their head office and was told that they will send it via my email address once they are online again but she didn't.Then I called them again yesterday afternoon at around 15:00 to check why they haven't sent the letter as yet and I spoke to Ian who said that he will check and get back to me but he didnt. So today the 3rd I went to their Dbn branch and spoke to Frankie who said that they can't help me cause Linda is dealing with my account and is on leave till the 8th. What is that,how is it difficult for them to check on the system and give me my Clearance Certificate without any issues cause I paid all my debt now?? I have been waiting since November for the certificate for why?Why does it take long for them to give me my certificate and why are they hiding behind the bushes telling me different stories before telling that I won't get it until Linda is back from her leave days. Cause they were standby consultants working during the festive season and they should know how to deal and help customers with whatever query they have but were are only told that Head office is closed and can't help you,so what is their reason to open the office then if they can't help us?? Their service was VERY POOR and unacceptable. I will never use them again and will tell all the people I know about the bad experience I have experienced with them via all social media,newspapers etc. I am really angry and disappointed with their service and they need to be taught on " Good customer service".