Update.
I was told that I would be moving to a different part of the store, that my hours would change from 11-2 to 9.30-12.30(I was happy with this) and that I would need to work 2 in3 Saturdays.
Then I went into work a couple of weeks ago and was told by my current manager that I wouldn't be moving departments, I would be working the same hours and I wouldn't be doing weekends(I currently don't do wekends)
None of this was put in writing, she told me verbally when i was in shopping
Then yesterday she said in passing "oh I need to see you about the changes to the roster, you'll be doing 2 in 3 saturdays". then nothing more was said as we were really busy.
Today iw ent in and couldn't do the job I am supposed to do, as I was helpign put the delivery out. Never got the chance to speak to her. had a sneaky look at roster though and she ahs me down next week working Mon,Tue, Fri and Sat.
No mention of this has been made to me, apart from the passing comment yesterday.
I know she will deny point blank telling me that i would be off on Saturdays, and the fact my Dses were then when she said will be irrelevant.
My contract is jsut for 12 hours, it doesn't specify days.
I think they are being a bit shitty over this TBH, The HR woman, who doesn't do weekends either has been told she has to do 2in 3 as well, yet her DH works weekends, and she ahs no one to look after her 11 year old DD.
Any suggestions or comments being made to the manager are greeted with a frim NO