Mrs Hamilton, who received her honour for services to justice on Thursday, said: “Personally my claim’s been settled but I cannot, cannot stop fighting until the rest of the group get paid.
“We fought in the High Court in 2019 and it took years to even get it to court… 138 of those people are still fighting. One hundred are dead.
“And I just find the whole thing wicked that they cannot be fair with people.”
On Friday, police said seven suspects had been identified in connection with the scandal.
Any criminal trial might be not be held until 2028, detectives said.
Mrs Hamilton said the DBT had claimed that there was little money for compensation, although it had employed an “army of lawyers” to “grind us into submission”.
She added: “Basically the Business Department owned the Post Office and they prosecuted us and destroyed us and they’re now in charge of the compensation.
“It really is the fox in charge of the henhouse.
“It should go to an independent body to be fair and they’d stop spending hundreds of millions they’ve spent on lawyers, which is obscene.”
The Horizon IT system, which began operating in 1999, falsely created shortfalls in Post Office branches for which sub-postmasters were held liable.
More than 900 people were prosecuted and some went to prison.
In a statement, DBT said: “We pay tribute to all the postmasters including Jo who have suffered from the Horizon scandal.
“We have quadrupled the total amount paid to victims with more than 拢1bn paid to thousands of postmasters across the UK and anyone unhappy with their offer can have their case reviewed by an independent panel of experts.”