What do you do when a Marriott lies to a Plat about suite availability? should you just keep quiet?

At one now, and the agent insisted no junior suites were available. But according to Marriott.com they have at least 3 suites available.

Was also denied the concierge floor, said that they were full - Marriott.com says otherwise.

I was on the Plat challenge for a backup chain but so far my experiences have been pretty poor....I think this will be my last Marriott stay (have over 250+ lifetime nights).