Today a tech(not a MB) after turning the key on, and all the lights came on, used a piece of metal and touched this specific part of the starter, it cranked and the engine turned on, so its not the starter.

So he had two wires connected to the starter and attached a push/start button inside the passager compartment.

In monday I'll take it at the official MB shop and see what's up.

Considering the situation as I explained it, what can be wrong and what's the worse scenario?

Thanks