Walmart Supercenter

My boyfriend and I bought a mountain bike, we don't want to buy an expensive one but we wanted something decent.  So we bought one from them; we drove it along the road then, the handle bars fell off.  We returned it to them.  The return process was fine, we waited in line and there were no questions asked.  Then we decided to buy a much expensive bike, and so we did.  We drove and took it a little further, surprisingly, the pedal broke and the chain came off.  We went back again to the store and returned the bike.  Again, there were no questions asked, no hassle and they just took the bike.  I don't know if there's something wrong with the assembly or the purchase of the bikes from the factory.  I will absolutely not go back to them anymore.