When I haven't got pay, can I say to my boss
You still don't pay
is this correct? Please tell me what I can say.
Possible things to say are
You still haven't paid me.
I haven't been paid.
I haven't received my pay.
(Thanks to @CopperKettle for the first one!) You will notice that all of these use the present perfect. This is an appropriate choice because the situation of "not being paid" is something that continues from the past to the present.
If you use the present tense "you don't", it sounds like you're talking about a general situation, as though your boss never pays you.