As somone who was in a somewhat similar situation, MB accomodated us by allowing us to cancel early, we had a similar issue in the Ateca after 2 years of lease.
Other than that, good luck. :/
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.