just want other people to take responsibility

I got a call @09:36 *** from some lady demanding me to pay for virgin active. firstly, they have been debiting my account for my ex and i did not have a problem with it as he was giving me the money, however my problem is i did not authorise virgin active at any point to debit my account for mr badenhorst. now they want to keep me liable for his gym payments? i owed virgin active and settled them. I am in no position to have a gun to my head for someone elses things. so mark also never signed for his membership to go off my account? who do I PROCEED LEGAL ACTION WITH? CAUSE this is violating my civil rights. then she has a nerve to say someone 8 years older than me is my son and i must pay for them? how pathetic and embarrasing!.... so either you get your things in order or I call an attorney to get you in order for *******LY DEBITING MY BANK ACCOUNT AND NOW WANT TO KEEP ME LIABLE FOR OTHER PEOPLES DEBT!!!