Extension of contract with without my knowledge!!! DO NOT SIGHN UP WITH PLANET FITNESS

I took up a contract with Planet Fitness linked with Vitality with a contract that was suppose to end effective date end of December 2021. they extended my contract without my knowledge and consent and now they are telling me i owe them money for an extension and month to month services that i never agreed upon!! This company is a ****!!! DO NOT TAKE UP A CONTRACT WITH PLANET FITNESS. YOU WILL REGRET!!!