I HAD A CONTRACT WITH ZONE FITNESS

hi there, a few years ago, about 6 years ago, if not longer, my sister and i signed up at Zone Fitness Brackenfell. we probably went 2-3 times max, but that's besides the point!!!! now i get threatening messages on my fone, and i cant remember who called me of Zone Fitness in Brackenfell, just to let me know that i owe them R4437.82!!! what the hell??? why after 6 years, sms or fone me to say i owe R4437.82 gor a Gym!! where did they get this information????? how do you owe a gym that amount!! its pathetic!! i want someone to make this right, because i am not payning zone fitness anything, i will report this ****/ incompetencies to every news paper!! this is highly disturbing!! imagine that!!! its easy to leave disturbing and threatening messages on someones fone, but i will not fall for this, i am very sori!!! i want this sorted ASAP!!!