Zone Fitness unsatisfactory operations

Hi I just last year had a agent speak me in to signing up with zonefitness i have a huge problem with this as I have only experienced bad service from zonefitness I now have a issue where they are sms me that my debit order unsuccessful I have called them and the person I spoke to keep on telling me they not the person to speak to they will have to take my number and give it to the account manager to give me a call back which I haven't received my problem is I have money in my account because I love paying my good debit I have I don't want a bad credit record because of this not sure if they do this to all clients because they want your account to go in to arrears so that you can be bound to them for a long period of time which I only have a 2 year contract with them I feel like zonefitness are ******** and *****s how do I deal with this as I'm not going in to a bank they need to do there job I was going to cancel my contract but the amount I need to pay is just pathetic!! Bad for business on all levels!!!!!!!