Have a problem speed form ATC

as I need to contact the Approach where it is active.

So Approach has sent me that the speed has to go down to mach 0.70. but can see it says ‘0.6999999998kts.’ Shortly after it sends me again to go down to 0.65. so it replies ‘0.6499999986kts.’ so I got to under 28000 ft so it send me back down to 180 kts it does not say anything above