BILLING AND TRANSFER OF LINE

I requested my line to be transferred to my new home at no charge as was informed on the telephone, it was done on 21 July 2015 and a new number was issued which I accepted as I was told to have the line installed and then request my old number again.<br> The line was installed , then I found out that the old number was not able to be transferred which I conceded to having a new number. I received an account which on which I disputed ref ***7 on 18 Aug for the service fee for the installation of the transfer which I was informed was free but have had no response to date, I did pay the rental of my line and adsl and calls so not as to have my line suspended, I have called on numerous occasions, no help, now I find out, when giving them the telephone number I have, it is on someone else's name but account is on my name, NO One seems to be able to sort this out and I go from person to person, very frustrating to repeat yourself when it is not even your fault., and it seems that my previous number is active as well, and the number I have been given is on someone else's name but I am being billed for it. where do I go from now!! <br>