I'm on probation I've only worked there a week and know I do not want to stay at all.

in my contract it says I must give one weeks notice to leave during probation. However, the law says you must give a weeks notice if you have worked at least a month which I haven't.

I'm still concerned they will accuse me of breaching the contact though.

But I feel they have breached their side of the agreement by changing my hours at short notice and not paying for me to stay longer on one shift. - would this be a valid argument or a dangerous one. Also how binding is the weeks notice in this situation.

I want to leave asap what would be your best advice?

I was planning on sending an email so they have a written copy but also phoning that morning to warn them.

please help thank you