How is the best way to hand your notice in?

[Zig27]

I accepted a job at an old employer. I should have known better as they don’t treat their employees well. The job is too much work which I told them when I was offered the job as I had time to think after the interview, I initially refused the job. These people are gaslighters and the manager is very unprofessional. The manager sent me an abrupt email asking why something was not done yet I was not asked, he is lazy and delegating his work to me and others. It is affecting my physical and mental health. I have raised the workload issue in an email and he chose to ignore it and let the supervisor deal with it. I only have to give a weeks notice. What is the best thing to say in the resignation letter? It is a waste of time trying to reason with these people.

Dear X
I am writing to give my resignation. My last working day will be 17 December.
Yours
Y

Agree with PP, keep it brief, include the date you resigned in your email/letter and your last day of work in line with your contractual notice period. If you want to discuss your treatment you could ask Hr for an exit interview but a resignation letter is not the place to air any grievances in my opinion.

Dear shitty manager,
Please accept this letter as notice of my resignation. My last day of employment will be xxx.
Yours sincerely

Agree with those above

Raise your issues in your exit interview