National Parts Module Experts, ECU for a S550 not fix it jacksonville Florida

I sent My Mercedes s550 ECU computer to fix it, spoke to Chris, nice person at the begining ,

they received my parts and sent it back to me without explantion, I had to call Chris and no

answer, I had to call form diferent number to fianlly, ge tin touch , I expalined to him the the part was

duplicating the same problem, to finally take it to the dealer where they have check it and the diagnostic

was faulty ECU, National Parts AKA Module Experst, never fix my ECU, they charge my $411.25, spoke to

Chris and he just play smart but just been silence and after I finished to explain to him, he just start talking

something else like I never say anythig, I have to call many times to finally get back $285.63, for something

that nerver did, the dealer took me inside the shop to show me the ECU, was nerver open just black glue on the

sides to make me believe they did the job..