In a joint letter to the Chief Executive Officer of Royal Mail, Dave Doogan told the Royal Mail Chief that it is "unacceptable to see the language employed by Royal Mail in threatening its workforce with job losses because they dare to ask for a fair work package."
The letter stated: "Clearly, this announcement to slash jobs is a tactic in the ongoing pay dispute with postal workers, and we believe it shows bad faith on the part of Royal Mail.
"We all need the unions and Royal Mail to work together to find a solution for our postal workers and our communities.”
Postal workers across Angus were on strike again last week with several more strike days going ahead this week from November 2 to 4.
Last week, the Royal Mail announced its intention to slash 10,000 jobs, citing the strike action and low parcel delivery sales as the reason.
Mr Doogan has called this move a "tactic in the ongoing pay dispute with postal workers" and has accused Royal Mail of "acting in bad faith".
Commenting, he said: "Postal workers across Angus are struggling to make ends meet in the face of the cost-of-living crisis while Royal Mail shareholders benefited from bumper profits in the millions.
"It is understandable that postal workers find the argument that there isn't money for them to have a fair wage unpalatable when there are millions of pounds of profit for shareholders, who should share the burden – and when hard working postal staff are struggling to put food on their table this winter.
"Royal Mail staff in Angus and their families need financial security.
"The decision to strike will not have been easy for any of them, but this is about more than pay; it is also about protecting the universal mail service we all expect and value.
"Royal Mail need to get back to the negotiating table – in a meaningful way - and put our communities at the heart of discussions."