Gmc service near Beltsville, MD

i was referred to this establishment by a close friend of mines and boy it was the worst experience ever. i came here to get a in dash unit installed into my husbands truck for his birthday. everything was good at least i thought about a month later the unit started flickering, the screen would get stuck, dvd's would get stuck. so i went back to ritchie road to get a replacemnt unit or have it checked out. i was shocked he was gone it was a guy out there i asked where is frank he said he up and left and went to baltimore. i called him at the number i was giving on my invoice he answered and told me yeah he moved and i was telling him the issues i was having but he didnt give me a address where i can bring the unit to get checked out which was odd to me. he just told me to call back i called back everyday for a week it just went straight to voicemail. so i decided to google his business and came across this site. my husband will be paying him a visit. i paid alot of money and i dont like to be ran from