BBL Nottingham Live Day 1a
$140 buy in
243 runners, no exits. top 90 paid.
blinds 50/100 - 2nd level. Starting stack 15k
Hero stack 19k
Opponent stack 15.5k
Average is 15k
Hero steady away early doors, not lost at showdown.
Opponent is active, often limping. almost always firing at flops.
Opponent raises EP to 375
Hero is the button and 3bets to 1025 with

This is where it gets interesting..
Opponent tosses in 2100 but with no obvious verbal declaration.
As I'm dwelling whether to smooth or 5bet, someone asks why the dealer hasn't done the flop, claiming the guy said call. I ask the dealer what his action is, all the while villain is saying nothing.
the dealer thought it was a raise as he heard no verbal call and we call the floor.
The TD rules that as only a couple of players heard the 'call' and the dealer didn't, it stands as a raise. Villain still hasn't said anything to agree or disagree.
I then 5bet to about 5900, wanting to look like abit of a steal, picking up on his 'mistake', hoping that if he has a hand he shoves but he just flats.

Opponent checks
Hero checks
Turn

Opponent bets 6,000
Hero calls
River

Opponent bets all in, just 4,000
Us?
His hand?
Appreciate any constructive comments to help my game, ty