3 wheels Boni Stroller

Bought a stroller at Baby R Us at Woodmead and it was not working properly and took it back to get a new one only to find that the other stroller as the same problem too. The stroller is very hard to control, push or to turn it around especially on tiles when at the malls. it only moves okay on tar roads.

I'm not satisfied with this 3 wheels Boni stroller, cause this the second stroller but it is uncontrollable.