Unhappy ex client

I was a member in 2019 I think around June, I had a problem of the gym not derbiting and I went to the gym to fix it fine but a month did not go by and I had to move to Eastern Cape and that's where I called the gym and spoke to a lady by Viwe if I recall. I explained to her that I am moving to Eastern Cape what should I do as they don't have Planner Fitness that side and the lady advised me to cancel and I said I would like to. I asked her the process and she said since I've called she will then deactivate my tag n she will note it down. I received a call today and a sms saying that am owing +-5000 which I find it weird as I cancelled and I've never received an sms stating that I haven't paid for a certain month the usual way they do. If I had received such I would have called again but they come only today to tell me that am owing them why didn't they send me an sms stating that there's a month that I haven't paid to show that the cancelation did not go through or was never processed?.