Billing of Gym Contract of it ended

I have phoned and wrote a letter to Zone Fitness with my complaint. See below: I am acting on behalf of my son Chad Williams, He is currently in Doha, Qatar, working there for 2 years. He has joined your gym, and you will notice that he has been to your gym for workout only once since he took out the contract in Feb 2015, The reason for his absence, is his work responsibilities changed and could not come. He has contacted your branch in Wynberg to ask if he can cancel and they said, he must then pay for his full 2 years because he signed the contract. He has been paying for the duration of the period and Feb 2017 the contract ended. He has been billed after his contract ended. Upon phoning to the Wynberg branch, I was told that the contract is continueing and that he has to go in himself to have it cancelled, and the billing will just continue. He is away for 2 years, which means he will be billed till he return to South Africa.

I am requesting to have his contract cancelled on his behalf and that the billing after the contract ended be reversed. He do not want any refunds for moneys paying after the contract ended.