New car - rights to reject

[AR101]

My 1 month old SL400 has been in the dealers for two weeks solid now (after an initial day when it was a week old) to try and fix a gearbox problem, along with a rattle. They initially felt it was software issue but the problem came back after approximately 30 minutes of driving. They're now replacing the gearbox control box.

I'm keen to get your opinions on what I should do? The dealer are trying their best but I'm so upset this has happened to an £80k+ car...

Is Mercedes reliability this rubbish normally? Do I have grounds to reject?

[AR101]

Thanks for your feedback. The issue is with clunky gears, mostly downshifts. The technician has acknowledged the issue but MB DE have been scratching their heads which is what has taken so long. I'm hoping this control box sorts it. I know rejection sounds messy so I would just wish they sort it once and for all

[AR101]

Update on this. Now on the 6th attempt to fix and 46 days of repair since January...

This is a total joke.

[AR101]

The dealer offered to replace the vehicle and then went back on their word because apparently rattles don't detract from driving pleasure. The issue is clear cut and at no point has anyone denied they are present!

Do you have the link re: the C class so I can get some idea on the process?

[AR101]

I know and they know that there is no leg for them to stand on.

I gave them a final attempt to fix. 9 days after the final attempt deadline, rattles still present upon giving it back to me.

FYI, the rattles are not faint - they are loud - their words, not mine!

I'm not backing down here and I want a refund.