Really sorry to hear that you are basically experiencing the identical treatment that I had in April 2024. I did the same and put in a rejection request within days of buying the new car - the dealer had it for 6+ weeks during this process (gave us an MG5 to use). At this point car only had 200 miles on the clock!
Long story short, MG pulled the characteristic card and so to progress from this point, it would have required reports from specialists and legal action to reject (it is obvious from the substantially delayed group rejection legal action that this is far from straight forward and carries financial risk for an individual).
Dealer was actually really unhappy with MG UK's response and did try their best to help (fitted decent Michelin tyres which improved the vibes noticeably and improved the car in all other areas).
Car has now done 18k miles and oddly, the vibrations have lessened to the point where sometimes they are completely unnoticeable at motorway speeds.
Anyway, MG UK's response was nothing short of disgusting and condescending (I have numerous e-mails from them stating the vibrations are normal on any 'performance' car etc etc) and personally this alone would stop me buying another SAIC car. I too have advised friends and family to steer clear of MG products plus they lost a sale of a Cyberster to my father who was close to putting down a deposit until my experiences.
It's a real shame as the car is incredible value for money and apart from this issue & the appalling software, we really like it (just as well really given it's now worth around £7!)
Thanks. Yeah, they obviously have this process pinned down now. Delay tactics while they make it look like they are trying to resolve it then come back with the same BS it started with. Then tell porkies to the finance company.
The “feedback from the road surface” bit really grates me (pardon the pun) as you could be driving over glass and it would do it.
I’m absolutely amazed that Santander won’t do anything because the manufacturer says it’s not a fault. Ultimately it’s their car if I choose to hand it back at the end.
Mine is so much better now, there is no point in me pursuing it thankfully. I’m still tempted to do a charge back on my credit card in revenge but it’s so mild now it would really just be to make a point. I got my brother, who has been a mechanic for 25+ years, to drive it after I got it back, and he reckons it’s nothing to worry about long term damage wise and I’ve had the balancing done since on his advice!
I’m just glad I can enjoy the car now and don’t feel the need to go to war over it!
I have driven one, had it for an extended test drive, and it had it really bad.
Mentioned it to the sales guy and he said I was only noticing it because EVs are so smooth and quiet and an ice car hides the vibrations because of the engine. I just laughed and walked away
You know I think that’s probably why they think they can get away with it!
Mine was really bad but now it’s just like it’s got an engine and a very minor wheel balance problem. If someone drove my car as it is now and they had never driven an EV before they would never know it wasn’t right.
They gave me a MG3 hybrid for two weeks. What an odd car that is to drive… perhaps that’s changed my perception of vibration

It was actually rather good for the money to be fair.