don't hesitate to contact me vs. do not hesitate to contact me

[Yosam]

When ending a business letter which is correct, please don't hesitate to contact me or please do not hesitate to contact me?

You assistance is appreciated.

[Alan]

Hi,

The contraction of 'do not' to 'don't' is simply an informal practice, usually used in conversation.

Alan
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English as a Second Language
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[Yosam]

Therefore, my co-worker is correct and I should use "do not hesitate to contact me".

Thank you.