Hi, this is Jim, thank you for the question - I will do my best to resolve this quickly for you.
Sorry to hear of the issue. Yes, you can sue for defamation. First though, send him a cease and desist letter to demand he removes his comments online.
A template “cease and desist” letter is available at https://www.lawdepot.co.uk/
If you go to the search box in the top right corner of the site, it will bring up a list - you want the "general" letter.
You can use your own letter if you wish - it just has to make it clear this is a cease and desist letter, that you demand they stop their conduct and remove their review, and that if they do not within 7 days you will apply to the court for the injunction and seek your costs.
A defamation claim requires that someone has either verbally said something (slander), or written something (libel) which was untrue and they knew it to be untrue - with the intention to damage your reputation. The untrue comments have to be brought to a third party’s attention to qualify.
There is a defence if the person who made the comments can prove the comments were true, or they held an honest belief their comments were true.
The limitation period is only 1 year for a defamation claim, so ensure you issue the claim at court within a year of the comments being made.
These claims are complex with them being heard in the High Court so you would be well advised to instruct a firm on a no win no fee basis - a few do offer this so you would not have to pay anything up front. Here are examples of law firms who could help you with this :
I hope this helps and answers the question which is easy to understand - please feel free to ask me anything else. I will reply as soon as I can to help with any further queries.
Thanks for using our services and have a good day,