TWO YEARS of FREE pool rent?

What would be the best way to find out how many swimmers there were three years ago in MDAC? Two years ago? last year? Gym gave them this HUGE discount to build up their numbers, supposedly- even tho it would have had ZERO effect on the swimmers as THEY received NO DISCOUNT on their monthly dues. The only ones who benefitted were the owners of MDAC. And NOW we find they havent even bothered to that paltry sum 90% of the time! Research indicates they havent made ONE payment for almost the last TWO YEARS!