ruling question (with anecdotes)

[mosta]

so I'm playing a lot more live b/c a lot of online sux now. tonight I go in with 800 and play 1-2 b/c the 2-5 has a huge list. the 1-2 plays as big as a quiet 2-5, b/c they mainly use red chips. standard pf raises are 15 to 30. (though the 2-5 does play very big sometimes with average 1,500 stack. and to give a sense of the room, one not unusual hand in the 2-5 was fold, raise to 35, raise to 100, 6 callers. so you can imagine how the 1-2 is.)

back to 1-2. I get down around around 450, 350 left. table breaks and I change tables. Hyper Agressive Asian Gambler is on my left. (he reloads for 500 with 500-chips 3 times over half an hour.) more background: my second hand is six limpers to me in BB with AKo. I make it 25. HAAG makes it 100. I shove for 350 ("let's play for all of it"). He calls with ATo. Sweet, I'm almost even. He reloads 500.

2 or 3 hands later I have JcTc. 3 or so limpers to me in LP. I make it 15. He says "25" and tosses a green chip. he thinks it was limped to him. discussion with dealer ensues. everyone's confused about what a raise can be. I mistakenly say, doesn't it have to be 30? dealer correctly says, No you didn't raise 15, you raised 13. Now I've spent my ammo. When I say, Okay doesn't it have to be 28, no one's listening to me anymore.

Dealer says to HAAG, It has to be 28, 3 more. At this point I could say, String bet! (I've learned, after string betting twice, that idiots love calling string bets more than anything. more than winning pots, it seems. and generally the dealers call them here immediately.) so, I don't want to argue against his raise too vehemently b/c it gives away about my hand. And I don't want to call string bet b/c I think it's obnoxious and stupid. but I really thought the dealer was going to call string bet.

question: Is "25", after 15, a sufficient action to allow a min raise? (or is it a string bet to make it 28? or was betting still open to make it 100??)