Bad service

i was a member at the zone fitness Gym and after i lost my job, they have claimed the contract was a 24 month deal and that i should pay 60% of the remaining fees and i was paying like R185 per month.

so since i was there for 5 months they said then i should pay 60% for 19 months which is totally ridiculous because i was no longer using their service and the worst part is that i was not told of the situation as i was still going through applications.

Please assist me because this is affecting my credit profile or credit score