I've got some sympathy for the OP. But some of the comments here were because the OP didn't provide all the details in the OP. It came out in dribs & subsequent posts & info changed with subsequent posts. So some of that he brought upon himself.

The OP doesn't say he called the PP line at the time of check-in when he was standing at the front desk to ask them to confirm w/ the hotel that they owed him the $$, when he discovered he wasn't given his guaranteed room type, which is the time when he should have done it. FTers have frequently reported calling the Plat line successfully to ask Marriott to clarify the hotel owes them the $$ for plat arrival gift. He mentions calling them later re: some issues & they say that's in the hotel's hands. The guarantee they could have sorted; the other issues might have been hotel ones that the CS line truly couldn't deal w/ & needed to happen at hotel level.

He had subsequent issues to the point he chose to leave & switch to a Sheraton. They may be valid issues. Whether enough to change properties is/was up to him. We weren't there. The subsequent issues have not been detailed by the OP, so we have no idea what they were.

But as IluvJetz says & which I agree w/:

"The problem isn't the $100 guarantee; it's the method you chose to try to get it. You disputed the charge with your credit card; Hunt Valley mangement has not agreed that you deserve the $100 guarantee. You should not have gone through the credit card company to dispute the guarantee; you should have called the Plat line and let them hash it out with the hotel. It would have been resolved then and there.

Will this eventually get resolved? Yes. Your account will be unlocked and you'll probably get $100. But you sure chose the wrong route to do that. This is akin to me having an issue with the post office. Rather than elevate my complaint through the postal system's management, I go directly to my Congressman. Sure it'll probably get resolved. But not in a timely manner and it'll be ugly in the interim."

Speaking only for myself I would not have disputed the hotel charge for the guarantee, which is actually what the OP did, and thus presumably why the hotel thought he was deliquent, since as jetz said they weren't necessarily in agreement w/ his stance. I would have contacted Marriott CS, then Marriott Concierge, and ultimately Bill Marriott re: the guarantee & receiving a check for the $$, as well as the other issues, and the ex-GM's piss-poor customer service attitude. But I wouldn't have contacted the BBB over a bed guarantee.

I do agree that Marriott or the property should have contacted the OP in advance to let him know they were going to put a 'freeze' on his account. No excuse on that one, and I would have been equally upset.

But it looks like the new GM did the right thing. Hopefully the OP will update his TripAdvisor and BBB accounts/correspondance to reflect that.

OVMV. Cheers.