Radio Station to Keyshia Cole -- Quit Your Bitching ... You Were Always #2

Keyshia Cole is sorely mistaken if she believes she got bumped to make room for a singer named The Weeknd at a concert in Oakland this week -- at least according to the San Fran radio station behind the show ... because fact is, she wasn't headliner material to begin with.

Keyshia went off on Twitter Monday night -- the same night as KMEL 106's Holiday House of Soul concert -- claiming she bailed on the show because KMEL contacted her last minute to tell her she'd be opening for The Weeknd ... instead of headlining the show herself.

She wrote, "EVERY F**KING YEAR I do something major for my city! @KMEL has the nerve to tell me at the last minute they want me to open for the weeknd."

She added, "No disrespect to the weeknd. Why the hell would @106KMEL ask me to open for him in My home town! Where I give back! Where IM FROM! #NO"

But KMEL tells TMZ, it's all a case of miscommunication -- saying, “We were surprised to see Keyshia Cole’s Tweets the night of our show ... as she was never scheduled to be the show’s final act."

KMEL added, "When we were notified a week before her performance that she planned to cancel, we immediately removed her name from all advertising and promotion and offered refunds to those fans who requested."