Don't drink at @pinki .
I've never bet an under in my life
Maybe just honest mistake then. Hard to see how they would change your bet afterwards. Onle way that i can think of is that they set up over/under wrong way. But in that case i think we would see lot of customers complaining about same thing. And it is customers responcibility to check betslip after placing it, before match they can probly do something about it, after not.