I made the mistake of buying a mountain bike from ...

I made the mistake of buying a mountain bike from Walmart and building it myself. I was impatient and did not want to wait a week for the guy build it but did not want to spend $700 on a bike shop bike. The bike was about $250.00 + tax and seemed to be what I needed for some family riding. I immediately regret my decision and decided to bring the bike to Sports Systems to be upgraded. New handlebars, stem, brake adjustments, tire set up and gear set up, ect. I got a phone call saying my bike was complete and when I asked if its riding good, the bike technician said as "good as I could get this bike riding"? I picked it up and everyone seemed to care very little that I was going to pay $$$ for this work to be done. They were not very personable in the bike shop. (Different experience than when I dropped it off) They did not even go over what they did, just clipped off old bars and handed me an invoice. After dropping almost as much as the original purchase price for the upgrades, I wanted to test it out. I did take the bike out for about 9 miles last night and with some minor adjustments to the seat and shock, the bike did ok. I get that it is not the best quality bike and definitely learned my lesson. If I upgrade or buy a new bike, I will get something better quality but don't think they should treat the customers negatively because its not a bike from Sports Systems. I have not bought a bike in 10 years, I am not a enthusiast. I just needed a bike to ride with my 9 year old son and hated the factory bars this Walmart bike came with.. I will be buying a better quality bike but probably just not from here. I will update after a month or so, give an update on the bike.