Probably because you are right on 30 nm (although I doubt the controller was that sharp...), at 30nm to 20nm its 220kts, Jepp page 10-1p8 in mixed mode and 30-15nm its 220kt if under 10 000ft when under radar control ...but its just confusing as if you are mixed mode you are under radar control, so then doesnt it only apply to under 10 000ft only as per the info on 10-1p9...
I follow the local way, 330kts until told otherwise! (joking)
But seriously the other night into VOMM a Indigo flight couldnt understand why we were maintaining 210kts at the end of the arrival where you get vectored to final ...because its on the STAR fools and we were all perfectly 10nm apart ! and we were all told to comply with the restrictions...can you not read!
Got you boys some 360 degree turn practice for your inability to read and play by the rules, and you had the hide to abuse the controller, shame on you!