Radisson shares cash out

I bought shares 7 years ago and now need ro cash out. I have been getting the run around from this group for over a year. I was given number 0791033303 for a Brian. This is the most useless person that does not answer the phone neither respond to whatsapps timeously. He recently sent me a document CM 42 which is a transfer form. Asked to complete and send back to him. How can I sign a document that gives him the right to transfer my shares to anybody. He says that they need to find buyers for the shares before they will pay it to me. This I think is just trying to ***** from me. Can someone who knows what is happening or what is the correct process, please contact me so I can get my funds out. If anyone that had the same issue and managed to resolve it, please make contact with me.