Presumably you agree that the solicitor should pay the agent, the solicitor has the money, and you have told the solicitor to do so but for some reason the solicitor is not.
As you appreciate, under the terms of the contract between you and the agent the liability is yours.
However you have a substantial complaint to make to the solicitor and you need to now put that in writing to the firm’s Complaints Partner and ultimately to the Legal Ombudsman.
It is amazing that the agent referred you to the solicitor and the solicitor is now refusing to pay the agent!
Having said all this, if in the agreement between you and the agent it is stated that the solicitor will pay the fees and you have instructed the solicitor to pay and the solicitor will not, then the agent needs to chase the solicitor, not you.
Tell the collection agent not to write to you again otherwise you will be take them to court to get a court injunction to stop them writing to you again on the basis that they are now harassing you. They should either issue court proceedings which you will defend, or leave you alone.
They are now in breach of section 40 of the Administration of Justice Act in respect of unlawful harassment of debtors.
Tell them that.
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