extremely bad service

good day I have been calling the company since last week asking for settlement letter. even today no one has assisted me they keep on telling me stories. no one has even bothered to respond they keep telling me that I will ask the manager even the head office. the service is very poor. I spent lot of airtime . they failed to give me details of the company where my account has been handed over to. so I guess the won't be calling me and ask me to pay the account if they fail to provide me with answers. even their agents they don't know what they doing they keep transferring. I have been holding for more than 10 minutes.