You may have a cause of action in Defamation against the author of the statement.
You must issue court proceedings within one year of the statement first being published.
For a claimant to succeed in a Defamation Claim, the following conditions must be met:
1. The statement in question must be a false statement of fact;
2. The statement must be negative and derogatory to the extent that it is capable of lowering the claimant’s standing in the opinion of right-thinking members of society;
3. The statement in question identifies or refers to the claimant;
4. The statement in question was published to a third party;
5. The statement must be capable of causing the subject “serious harm” if allowed to stand.
There is no cause of action that sounds in damages in English civil law if another person simply lies to you, even if the lies are repeated and sustained over a long period of time. The lies must be tantamount to an attempt to defame or defraud you to the extent that they have caused you, or are capable of causing you, financial loss or serious reputational damage.
I suggest that you instruct specialist reputation management solicitors to send a letter of claim to the author of the statement and have them sign an express written undertaking not to repeat the comments as well as providing you with an express written apology, retraction, and correction.