Inadequate knowledge on promo treadmill

I recently bought a treadmill from Sportman's warehouse (NordicTrack C100) - good entry/mid level treadmill. After reading the manual I realised that the treadmill could be used with a heart rate monitor transmitter. However, neither the manual or the manufacturer website specify the brand/make/model of the transmitter. I called both Century City and Parklands Sportman's branches which both confirmed the treadmill is not compatible with a heart rate monitor. I then went to Tygervalley branch hoping for a demonstration that would convince me that the treadmill is compatible. However, both the treadmill salesmen confirmed what the other branches said that the NordicTrack C100 is not compatible. I then asked a friend to loan me his heart rate monitor transmitter (chest strap) and lo and behold, the treadmill picked up my heart rate on the treadmill display. I honestly think all the treadmill salesmen just didn't know but would rather not say that and instead gave the customer the wrong information just to get rid of an inquiring customer. My mistake was too assume the salesmen knew more about the product he is selling than I could on my own.