reason being, there are many other direct debits on that card, for utility bills for eg.

I have a direct debit set up with PCCW via my HSBC credit card. Basically my sister had fraudulently signed me up for a 3 year contract using my signature. bitch I know, but I have no interest in getting her charged. I will be moving into the the flat soon and want to start a contract with HongKong Broadband or 3 since they offer fibre optic broadband at significantly better price than what PCCW charges for a slow 8Mbps line and they have no fibre optics set up there either.
Regarding the broadband, would terminating the 3 yr contract with PCCW then starting a new contract with
HongKong Broadband or 3 mean the new ISPs wont be able to provide broadband or are they completely independent? Or should I start a contract with them first then terminate PCCW? I am concerned about not having any broadband as its needed for work.
Basically, how can contract be terminated?
can new contract be up and running with the "illegal" termination of PCCW line?