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Sounds like you either have a defective valve cartridge or possibly a bad shower head. Is it quiet in one diverter position or does it scream all the time?
Ok, if the noise doesn't happen when either head is on by itself then the problem is likely in the diverter. You need to call the plumber back and have him take the diverter apart and clean it. There could be some debris in the valve that's causing the noise. If that doesn't work it may need to be rebuilt or replaced (only as a last resort).
Do you have more questions?
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