I'm on the portion of digging to the storeroom and Sonya just will not come and destroy this wall that I activated, just sits there and doesn't move, doesn't follow us around anymore either, I reloaded previous saves too but nothing works, why is half this damn game buggy and broken?

I seem to recall something similar happening to me .... I was getting very frustrated but then it turned out I was trying to activate the incorrect way through. The quest continued as normal after I went exploring a bit and found an alternate (/the right?) wall to break down. Might be the same case for you??

Nope, the robot physically is just stuck, will not move or follow us anymore, not to mention my dialogue no longer shows up either. Just tried waiting on a bench in the underground area for 24 hours, didn't seem to fix it either.

For the last wall, you need to talk mel.

I'm already well into it, as in probably on the last wall.

It says this individual is busy when I try to speak to him, it's as if him and Sonya have been given the order to take out the wall like I asked them too, but they'll never fulfill it, Sonya is just stuck floating and cannot take any damage what so ever.

Yeah, you have to talk to them before you can break down the last wall.

There's some sort of "are you sure you don't want to do anything else first" break point there for some reason.

Like illuknisaa said, for the last wall you need to speak to Mel.
If it is actually bugging out on you then possibly try saving and exiting the game and reloading etc. sometimes works. If not then a previous save is all you can try

I highly doubt it's because of that, this is most likely a game breaking bug

I had a problem with this too, you can try to nudge the NPCs into the final room to get the dialogue triggered, other than that you'll just have to wait and hope the NPCs mingle around a bit and get to the correct location for the converstation to proceed.

This happened to me also, multiple times. I eventually had to load a save before I entered the dig site and then ran through it as quickly as possible before the bot glitched out again. Be warned that she might get stuck in the floor once you get to the train tunnel. Had that happen to me twice during playthrough.

I had the same problem at the last hole...took about 10 minutes...did all the above...Mel never acknowledged or instructed Sonya to do anything...then suddenly the wall blew up on it own with Sonya not near the wall at all...I was about to give up

I had this as well... reloading a recent quicksave sorted it out for me...