I had a bad experience with JIB in The Mall, Korat.
I needed a video card for my older PC. I told the man behind the counter what PC I had, and he gave me a card that he said would work. Well, it didn't work, the computer wouldn't start up. So. took it back. The guy that does computer repairs gave me another card and said it would work. This card cost about 1,000 baht less than the first one. But, they did not give me a refund, only store credit. So, I bought something else for the 1,000 baht. I brought the new card home and it didn't work either, again the computer wouldn't start. So, I went back again. This time, they said that I couldn't get a refund or store credit, because it's the second one that I was returning. Needless to say I was quite upset. I walked out with a useless card. I'll never shop at JIB again.
So, be warned if you want to return something. You might get burned too.
BTW, I got a card from Lazada that worked. I should have done that first.