Been in new job for one month. Utterly horrible and stressful, taken a toll on my health and I will be resigning. My notice period is 3 months 
but considering I have been in position for one month and they haven't treated me very well can I give a week's notice? Would there be any repercussions?
I have been under a huge amount of pressure in this role to reach targets and am scared they will ask even more of me when I resign. Boss has been ringing me daily and has been hugely demanding since I started. I've never had a boss like this. Once I resign it is reasonable to ignore calls, cancel meetings and do everything else in writing?