Not interested in solving a problem

I'm utterly disappointed. I canceled my children's membership the 12th of June 2024, upon which they told me all the fees have been paid. End of August I start getting messaged their membership hasn't been paid. I moved my membership to a cheaper club in August and canceled in September due to affordability. I've been on the phone with them every month since August to try and sort this out. Upon which they always respond we will look into it and get back to you. I received the sms of owing them money again today. It's now November. I am fuming.