We bought 4 new tires 200 plus for each tire only ...

We bought 4 new tires 200 plus for each tire only around 6 months ago if that! My husband noticed 2 bubbles on both tires on the front of the car so we immediately called our local tire discounters near us to ask what the bubbles are? The guy said we must of hit pot holes on BOTH tires which was not the case. We took it to another place and the guy said it could of been pot holes that were not even noticeable that were hit he also went on to say they are just not making tires like they use to so unfortunately they are going to charge us AGAIN for two more new tires. Not happy at all.