Planet Fitness slowing the process on purpose?

I have been a Planet Fitness client for almost a year now. My contract expires on 9 January 2018 and because of financial reasons I cannot renew my contract. I sent an email to give my 30 days' notice on the 1st of December 2017 (to give them ample time) I only received an email on 9 December that my request was received. When I phoned on 14 December to follow up I was told that a consultant was only assigned to my query on 13 December and someone would phone me the same day to follow up. No call was received. When I phoned again today on the 15th, I was told that there is no status aka nothing has been done yet. I feel that the Planet Fitness call center delays these requests on purpose so that it rolls over to the next month and the monthly fee is subtracted again.