My Renault’s ECU is acting up, anyone used 800Sayara in Dubai?

I'm really hoping someone here can help me out because I'm getting pretty desperate with my 2018 Renault Koleos. A few weeks ago the check engine light came on and the car started going into limp mode randomly, which is terrifying when you're on Sheikh Zayed Road during rush hour. I took it to a garage near my place in Al Quoz and they charged me 500 dirhams just to tell me it's an ECU issue and that I'd need to take it to a specialist, which was super frustrating because I feel like I just wasted time and money for nothing. I've been looking around for someone who actually knows Renaults and their electronics because these French cars can be really particular about diagnostics and repairs. I came across 800Sayara online and saw they offer mobile repair services, which would be incredibly convenient since I work in Dubai Marina and can't really take time off to deal with this. What I'm hoping to find is precision Renault repair by 800Sayara Dubai from someone who has the proper diagnostic tools and experience with these vehicles, not just a general mechanic who'll guess their way through it. I'm specifically worried about whether they can actually reprogram the ECU properly or if they'll just try to replace it with a used one and hope for the best. Has anyone here actually used them for electrical or engine management issues on their Renault? I'd love to hear about your experience, especially regarding their diagnostic accuracy and whether they actually fixed the problem or just patched it temporarily. I'm also curious about pricing because I've already spent money on useless diagnostics and I don't want to get ripped off again. Any honest feedback would be massively appreciated right now.