Bad experience and being bul**** by gym company

I wanted to cancel my gym membership because I do not afford it I am unemployed.Last year December someone signed me up but it was signed with a pencil at Umlazi mega city gym company I was only 18 and I was bul**** into joining the person who made me join took away my hand bag and told me that I will not get it unless I join.I was told that when the gym opens I should come and sign the official contract with a pen and when I come to the gym to collect my tag that’s when the contract will be active but not once did I go to the gym now I am being harassed about payments I have no idea of.I am not happy with Gym company because I did not join willingly I was forced to and I did not sign any official document.