Debited wrong

I changed account and received a sms that my banking details were updated. I called Bellville zonefitness and apparently the manager was busy but she is not responding to my emails. Now FNB charges 110 for missed debit and zonefitness charges for missed debit. How did I miss a debit you debuted a closed account. I am already out of pocket because I must pay FNB, I want to still gym but I refuse to take blame and pay the additional fee. Zonefitnessat reception told me there was no form needed because I received the sms, now zonefitness does not want to take ownership but wants to charge me more? Why when you already put me out of pocket for 220 due to the missed 250 and 185 for an additional member. Please email me directly back