Month to Month contract - be careful

I signed up for a month to month LTE home WiFi but after a month of battling with no signal I cancelled it. They said I have to give a month notice and then went and deducted R999 When I enquired what it's for they indicated a cancellation fee This was not indicated when I signed up I've asked for my recording where the agent said I cancel at anytime and there are no costs involved but of course they cannot give it to me and are full of excuses Highly disappointed