I think the mileage extension above gives you solid footing to "fight back" both regarding the oil change interval, and getting the car serviced on time (on case they argue that the service could have picked up on some precursor to the failure e.g. low oil level)
Anyone will be able to tell you that exceeding an oil change interval by a few thousand miles will have no tangible effect (in the very long term it may cause varnishing or sludge but this would be over far, far more miles and after continual neglect).
From the sounds of it you've had some sort bearing failure which has subsequently clogged the oil feeds to the other bearings causing overheating and then seizure. Very uncommon but even for the rarest of things; it inevitably happens to someone at some point.
I suspect MB will put up some resistance but I think you have enough in your favour to get it satisfactorily resolved.
Anyone will be able to tell you that exceeding an oil change interval by a few thousand miles will have no tangible effect (in the very long term it may cause varnishing or sludge but this would be over far, far more miles and after continual neglect).
From the sounds of it you've had some sort bearing failure which has subsequently clogged the oil feeds to the other bearings causing overheating and then seizure. Very uncommon but even for the rarest of things; it inevitably happens to someone at some point.
I suspect MB will put up some resistance but I think you have enough in your favour to get it satisfactorily resolved.