Phone the company and speak to the manager or local exec. Explain situation request deletion of comments on the basis that it is untrue and defaming. If no joy,!. Write them a formal hardcopy letter witht he facts. 2. Failing that, get an attorney to also write them.
Write these to the highest management level you can find in the company
If that fails, advise them you will be filing a lawsuit for defamationa nd damages if it is is not rectified in 3 days.
A