Rover workers yesterday said they were "frustrated and furious" at receiving redundancy notices which gave no indication of how much money they would receive.
At least 5,000 letters were sent advising staff they had an appointment at the Longbridge plant next week to discuss how much they would be paid and their futures.
Philip Hanks, aged 39, from Kings Norton, Birmingham, worked on Rover's paintshop assembly line for 15 years.
The father-of-two said he read the redundancy notice several times for the amount he was owed and was stunned when he realised it had not been mentioned.
He said: "I am absolutely disgusted. This is a total disgrace. There is just nothing in this letter. There are no figures for starters. We expected to be told how much our redundancy payment would be at the very least.
" Instead there is an alphabetic list of names and the times we are expected to turn up at Longbridge for a chat on our future and how much money we are going to get. It doesn't say when we are going to receive our P45s either. It couldn't be worse.
"They couldn't even get the number for the helpline right. They have a note inside the envelope apologising for the fact that the number on the redundancy notice is wrong."
Mr Hanks, who earned £20,000 a year, now hopes to retrain as a plumber.
He said: "I would never have taken redundancy. I had a great job which I really enjoyed. It was decently paid too and I thought it was secure. If the Government sticks by what it has said, I will retrain as a plumber. I won't be rushing back into a factory job, that's for sure.
"There's not much hope for British manufacturing at the moment. I think the way forward is to learn a trade."
Rover workers have been told they will be paid £280 a year for every year of service, up to a maximum of 12 years.