Company wants to take my phone number.?

My company has been paying me a phone allowance of $60 for the last three years. My current phone bill is $120. The company has demanded that I relinquish my phone number to them, And that they would provide me with another company issued phone number. I only use my personal telephone for work calls during... show more My company has been paying me a phone allowance of $60 for the last three years. My current phone bill is $120.
The company has demanded that I relinquish my phone number to them, And that they would provide me with another company issued phone number.

I only use my personal telephone for work calls during after hours calls received, or from clients that are out of the country who preferred to call my personal phone line.

I was also told that this was not an option and that I must comply.
This has been my private phone number for approximately 20 years.
Is this legal? Help please.
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