How long have you had the car? CVT's rise up to the maximum torque of the engine and pretty much sit there until you ease off or they run out of ratio. That's not far off 4000rpm and can make the engine sound like its really screaming if you're not used to it. However, if you've had the car some time and its got worse then obviously something's gone wrong.
It may be a gearbox fault or it may be a clutch fault. If you park the car on a very level surface, and put the car in gear with the engine idling and then raise the revs very slowly, at what RPM roughly does the clutch start to engage. You will feel a very slight juddering as it does this. Should be roughly 1100-1200rpm, in other words, not all that much above idling speed. If its significantly higher then your clutch is slipping/worn and you'll probably need a new one.
Other than that it could be a vacuum leak. A quick check to see if the change up is roughly working is to go along fairly slowly, say about 20mph and then switch the low gear switch on. The revs should quite quickly rise up and you should get an accompanying increase in engine braking. If you get that then chances are the transmission is changing up as it should.
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