Worse ever

I regret the day I joined this gym it is the worse ..I have been receiving calls from them that I did not pay there system was slow and couldn’t update my information I received a call again last week that my payment have been updated and I can go and gym again ..just now I received a call from them saying they handed me over because I am due they didn’t even check there system they are fast to damage our credit score I will not leave this matter here..I have full proof I want to Stop my membership with immediate effect they are very unprofessional