Zone Fitness Milnerton dont care about their customers

I signed a contract with Zone Fitness Milnerton almost 2 years ago. I only attended the gym 3 times in that period. After becoming unemployed, I requested that they freeze my account until my situation resolves itself. I have been a loyal customer for more than 10 years and have always paid my account even though I didn't use the gym for months on end. Now they are threatening me with legal action. I used the gym 3 times in a year. I have not cost them anything because my absence from their gym doesn't affect them financially in any way. I will now rather use another gym when my financial situation improves because the way they treat their loyal customers is a disgrace.