The cost of My gym payment freeze with Planet Fitness

My son Khyle Christians signed up with Planet Fitness for a 12 month contract last year 18 October 2019, which expired on 18 October 2020. I have sent an electronic cancellation letter to the gym on 16 September 2020, to notify Planet Fitness of the cancellation and that Khyle will not be renewing the contract.

After many other emails I eventually emailed the head office of Planet Fitness and received a call later that week and the consultant told me I owe Planet Fitness 5 month of fees for the months the gym was close and payments was frozen, even though my contract expired on 18 October 2020. The Gym, without any notice or warning via telephonic communication, email or SMS, during lockdown or after the Gyms re-opened decided that they are in there right to re claim the payments that was frozen. If I didn't do the courtesy by sending an email informing them about my cancelation that is due on 18 October 2020, i would have never known their intention to deduct 5 additional payments outside my contract window of 12months, or even get a telephone call from them.

Now Planet Fitness is threatening me with the clause which forms parts of the contract "Act of God"

I am aware that membership/debit orders were frozen for 5 months during the lockdown. No service was rendered by the Gym. I made it clear to Planet fitness that I do not want to extend the contract.

Please can you advise me how to go about this matter, because the Gym will blacklist me if I reverse the payment(s) of R399 per debit order, which my son do not have. He is unemployed after the lockdown.

I do not need to pay a cancellation fee to the gym, since the 12month period is completed.

NB: Yesterday, 17th Nov. 2020 Planet fitness deducted a strange amount of R438 of my bank account, even more than it use to be before the contract expired on 18th Oct. 2020 without notification or explanation.

Please help and advise me "Hello Peter"

Thanking you