I purchased a 2018 Mercedes-Benz A-Class in January 2019. The dealer told me at the time that I would be able to get the Mercedes Me functionality when it became available later in the year and we discussed various features I had seen in reviews and press releases. Fast forward to today and I am now being told that my car along with others may not have the functionality promised and it will be up to Mercedes as to if they will resolve it. Several other owners on the A-Class forum are in the same position so I wanted to ask if there is anything we can do? I believe the value of my car will be less than a similar car of the same spec because it doesn't have the connected functions that a 2019 will and this was not explained to us at the time of purchase.
Your first port of call should be to Mercedes to register a claim for updating your car. It would help if you had the promise in writing, otherwise who is to say who said and promised what. If you feel strongly about it perhaps you could get other affected owners together and contact Mercedes as a group.