Bike in very poor condition sold to customer

I am fully aware that I bought a second hand bike so I would expect wear and tear. Bike Market do give a ride ready guarantee. This was on top of being told that bearings were replaced and the rear triangle on the Giant Anthem was completely redone. On my sons second ride the crank arm fell off... luckily he was not injured. They did respond to my call and came to fetch the bike in Pretoria to fix the crank. They also promised to do a full service and replace any parts that was overly worn. I received the bike back the very next day. That weekend my son had a Schools Spur series race. At the event we noticed that the inside plate of the rear derailleur was bent so badly that the chain kept on climbing off the derailleur. In desperation I then took the bike for a major service at a local shop to determine the full extent of the ******* I bought. They showed me the spare parts they had to replace. Almost all bearings on the bike, cables that had rust inside, the inside plate of the rear derailleur, seals on the front suspension, all the bearings on the pivots of the rear triangle and a lot more. Almost R5,000 later I may have a ride ready bike but certainly not off the floor as they claim. I for one will not deal with them again. I was made to believe that the bike was in a "very good" condition. An expensive lessen learnt. I could have phoned them again and I am sure they would have offered to fix it again. After receiving the bike off their floor in a dangerously poor condition I was already very hesitant to trust them with the repairs but I did send the bike back. After all the other issues we picked up after they returned the bike I would not consider any further interaction with Bike Market. These things should have been sorted out before they took my money. I gave them the opportunity to rectify the condition of the bike and that was their promise when they came to collect it. They simply did not deliver. Poor quality of service and little attention to detail in their workshop.