The vendor claims that he terminated his contract with Penyards after becoming unhappy with the service received.
Tranter's website states that during his contracted period with the agency, someone viewed the property but did not purchase.
He says that almost two years later the same person bought the property through a different agent running a new marketing campaign.
On the website, the vendor claims that Graham Evans, the firm's co-founder, subsequently pursued a fee and interfered with the sale.
Evans subsequently secured a court judgement for the fees to be paid in full.
Tranter's website claims that the scenario nearly bankrupted him and has cost over £45,000.
Tranter references a clause in Penyards' Sole Selling Rights contract which states that total fees and commission will be due if:
'Unconditional contracts for the sale of the Property are exchanged after the expiry of the period which we have sole selling rights but to a purchaser who was introduced to you during that period or with whom we had negotiations about the Property during that period.'
The vendor contends that the clause is a breach of the Unfair Contract Terms Act.
The seller claims that the agent must clarify in writing if they intend to reference the clause in the future, something he says Penyards ignored.
He also maintains that the contract went past its six months limitation.
"We do feel that this has not come soon enough and that it’s criminal the Evans’ were allowed to continue in practice for so long even after all regulatory authorities were contacted," writes Tranter on his website.
"We took every avenue open to us but the industry closed ranks to protect their own."
Tranter's campaign is aiming to have the aforementioned clause struck out of estate agent contracts and he actively encourages vendors to 'go elsewhere' if an agent refuses to remove it from their terms.
The campaign website details in full the vendor's complaint made to the Property Ombudsman Scheme as well as correspondence with the National Trading Standards Estate Agency Team.
Estate Agent Today has contacted Penyards for its response.
Earlier this week we reported that the agency was sold-out of administration for £180,000 to Number 17 Marketing Ltd.
The pre-packaged sale secured the jobs of 32 estate agents.
Administrators Begbies Traynor revealed that the firm which was founded in 1988 had accumulated debts of over £1 million and owes significant sums of money to HMRC, Lloyds and Newsquest.