Account problems in ex partner name.

Hi can anyone help me out or advise me on what best to do please? I having a number of issues and I have virgin media tv and broadband the account is in my ex partner name and details 

but it is installed at my home address he no longer lives with me at the same address the virgin media is installed at 

I want to change the account over into my name and email address and number so it goes into my details as I'm the one who paying the bills by my direct debit aswell.

I don't no the account number or  reference number we never had one and it in his email address and details or his password I don't know to login.

I only know his full name and what his  rememable password was .

How can I keep my virgin media but change it all over into my details do I re-register for myself? Or do I just  switch  provider's ?

 I was only paying only 57 pound for a  12 months contract and since the contract ended I  paid 147 the one month and it gone up  to 157 in a matter  of 2months.

I also need to change package deals because I can't afford 157 pounds when the TV and the one box doesn't even work ..

WiFi is fine and that what I like to keep