The latest strike by Post Office staff is expected to close Dundee and Perth’s main offices on Saturday.
The walk-out is the sixth time staff have taken part in industrial action this year in a dispute over plans to franchise 70 offices across the UK, including Perth, as well as pay and conditions.
Tony Sneddon, representative of the Communication Workers Union, said workers are still fighting for a consolidated pay rise for this year and last year.
He said: “It is quite ironic that they presented us with an award for our travel services, such as passports and travel money, at a lavish ceremony in London just over a week ago but don’t see fit to recognise the work of the staff by giving us a consolidated pay rise.
“Talks are continuing but there has been very little movement.”
Saturday’s action will concentrate on Perth where Mr Sneddon said he will join staff on the picket line.
He added: “Perth is one of the crown offices earmarked for franchising and we need members of the public to write to their MPs to try and stop this.”
Mr Sneddon said the strikes were a two-pronged attack against the franchising and the pay freeze.
He said: “Staff in Dundee and Perth are resolute. Most staff in the Dundee office have dedicated their whole life to working at the post office and we feel we are belong treated unfairly.
“Over the last three years the post office has paid £3.5 million in bonuses. Why can’t they use that money to give us a consolidated pay rise?”
The offices are expected to remain shut as Mr Sneddon said the post office had not put a plan in place to bring managers up to man the offices.
The Post Office said it was disappointed the CWU is still refusing to recognise the challenges faced and the need to address its £40m a year loss.
Kevin Gilliland, network and sales director at the Post Office said: “We regret any inconvenience that may be caused.”