If you vacated the property and you haven’t received your deposit back, then you need to file a dispute with the Tenant Deposit Scheme. Each of them has a different procedure.
I don’t know how much rent you withheld and whether it was in proportion to the amount of the garden although you wouldn’t have had much use of the garden during the winter.
Can the solicitor keep opening and closing the case? No.
If they harass you without issuing court proceedings, then it’s a breach of section 40 of the Administration of Justice Act. Tell them that they either close the file or issue court proceedings against you because if they write to you again without issuing court proceedings, you will be seeking an injunction against them and their client to prevent any further contact with out the issue of court proceedings.
You need to bully them now, don’t be bullied by them.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have