Sorry to hear of the issue.
The landlord clearly shouldn't be evicting you, certainly not until the tribunal has heard this dispute and made a decision.
I don't know why the lawyer has done this when clearly the dispute has not yet been resolved.
You can reply to the landlord that they are attempting an illegal eviction and you will oppose the demand to terminate on that basis.
You should stay in the property until the outcome of the decision is known - in addition, you should notify Threshold (the housing charity) of the landlord's conduct - you can reach them by telephone on 1800 454 454 or you can reach them via their website which is here: https://www.threshold.ie
If you prefer a lawyer to deal with this and to contact the landlord, you can find a local solicitor via this site :
https://www.lawsociety.ie/Find-a-Solicitor/Solicitor-Firm-Search
Given the landlord has a lawyer, it would make sense for you to use your own so as to be on a level playing field in this dispute - I would hope that Threshold could help you without you having to do that however.
If money is an issue for a lawyer, you can ask your local legal clinic for assistance - they are free to use and yours is here:
https://www.flac.ie/help/centres/longford/