2:26 PM -- A rep for Feldman tells TMZ ... Margot was fired due to "highly unprofessional behavior," which included violating her contract. The rep goes on to say Margot made false accusations against Corey, and he looks forward to seeing her in court.

Corey Feldman's holding out on one of his Angels, and she's so pissed about it ... she's ratting him out to the state of California.

According to docs, Margot Lane filed with the CA Labor Commissioner's Office ... Corey's company failed to pay her for angel services rendered. Margot says she's owed $1,470 in salary for the period of Aug. 3 to Aug. 12, 2017. Doesn't sound like all that much, however ... there's more.

In the docs, obtained by TMZ, the state says Margot's owed an additional $6,860 in penalties for the unpaid wages. Grand total is $8,330.

Margot served as Corey's musical director and also played guitar and piano in his backing band -- the Angels.