Gym Contract Collection - We cancelled via phone - collection agency says that is not the accepted procedure now going to court

Wife & I joined The Zoo Health Club. I was going reguarly;but needed a hip replacement. Contected the gym and asked how do I go about cancelling and was told the phone call would be sufficient. Several months later, my wife cancelled her membership via phone. We though everything was ok. Then I started to receive repeated phone calls from National Fitness, the collection company utilized by many fitness establishments. This has been going on for a year. They called today and said they are serving me papers to go to court. My wife, who cancelled via phone, has not had any problem with her cancellation. National Fitness states we are going to pay in the upwards of $2,000.00 for legal fees. I might add while on the phone they said "hold on" came back and said we checked with the disability program and you are not signed up for that. That is an outright lie as there are HIPPA laws regarding information. I am not disabled; just had a hip replacement. Thank you.