Bad service ever

Worst experience with slater gym. I singed a 12 months contract in January this year. I signed the contract with them because they had a care take for our kids. When i returned to the gym last month was told kids are not allowed at the gym anymore and my son has no1 to stay with at home. I requested that they cancel my contract cause it wont be worthy to me anymore cause the is no1 to look after my son. They told me i should pay the outstanding amount. I refused cause its not my fault they don't have a care taker for my child anymore. They still debiting for a service am not getting. I want them to cancel or get a caretaker to look after my son.