Possibly good system but poor quality, not reliable

We brought this unit around 3 years ago, was not cheap. Due to circumstances at the time it did not get used so much. Started to use it again around 2 months ago as I gave up smoking, so wanted something to help combat the weight gain. Only started slowly to build up, so around 10 minutes/day. I felt and could see the difference but then bang! ....What looks like a rotating collar which is attached to the foot rests has shattered leaving a mass of broken alloy material bits and several large grease deposits on the carpet. So now, we have a ruined carpet and LTT . Also after looking for quite awhile, no chance of getting any spare parts. I feel very disappointed and ripped off.
Insult to injury, I now see they are around a third of the cost we paid, want some advice ......leave it alone and look for something built stronger that will take the use as intended.