Many thanks for your patience, I am pleased to be able to continue assisting with your query now. First of all, I am sorry to hear about the issues you have experienced in your situation.
Just because the seller says the deposit is non-refundable, does not mean they can keep it no matter what. There is still an expectation that they would act in a fair and reasonable manner and not make a profit out of you nor nothing. If they have suffered losses as a result of your change of mind, such as relisting fees, unable to achieve the same sale amount, etc then they can potentially use the deposit to offset against these. However, if they cannot identify any actual losses then the unused amount should be returned to you.
If they refuse to do so you can consider whether to pursue them in the Small Claims Court to try and recover it.
If money is owed by one party to another, the debtor can potentially be taken to court to try and force them to pay up. However, as legal action should only be used as a last resort, there are certain steps that should be taken initially to try and resolve this matter informally and without the need to involve the courts. It is therefore recommended that the following steps are taken in order to try and resolve this:
1. Reminder letter – if no informal reminders have been sent yet, one should be sent first to allow the other party to voluntarily settle this matter.
2. Letter before action – if informal reminders have been sent but have been ignored, the other party must be sent a formal ‘letter before action’ asking them to resolve this amicably within a specified period of time – 14 days is reasonable. They should be advised that if they fail to make contact to resolve this matter, formal legal proceedings will be commenced to pursue them for the money that is owed. This letter serves as a ‘final warning’ and gives the other side the opportunity to resolve this without the need for legal action. There are numerous templates available online for such letters and a simple search will bring up a list of useful results.
3. If the letter before action is also ignored, formal legal proceedings can be initiated. A claim can be commenced online by going to https://www.moneyclaim.gov.uk/web/mcol/welcome. There will be a fee payable, which depends on the amount that is claimed. The debtor will eventually get a copy of the claim and they will have a limited time to answer it. They could accept it and pay what is owed, they could accept it only in part and defend the rest, or they could outright reject it. They could also completely ignore it, in which case judgment will eventually be entered automatically against them. Also, it is worth noting that the simple act of submitting a claim could show the debtor that this is being taken seriously and prompt them to consider negotiating a potential solution to stop the claim progressing further, such as offering full or partial repayment.