California Total Fitness CalFit Manteca Contract paid in full, they continue to bill me! Manteca California

I signed up in January 2019 for a years service, the contract states I would pay the initial payment and then 11 payments would be automatically deducted from my debit card. If I want to cancel I need to visit the location to cancel at the end of the 11th payment.

I went in to sign a cancellation for the last payment December 3, 2019 I was told I misunderstood the contract and ALTHOUGH it says 11 payments that does not include EVERYTHING although I paid January 2019 I would also need to pay 11 more payments PLUS one more payment January 2020. THAT is an additional 12 payments in addition to the sign up fee paid in January NOT 11 as the contract states.

The person at the desk, did not give me his name, I went back to the establishment to speak with the owner, he said I was confused a year is January to January I informed him a year is TWELVE months, the contract says the initial payment plus 11 automatic deductions not 12, Steve the owner continued to tell me his 'Lawyers' say this is how it must be blah blah blah I don't know but 11 automatic deductions is FEBRUARY TO DECEMBER, that is what the contract says.

They continue to bill beyond the contract and are not allowing me to cancel.