Hi, received contract just before started new job. although no agreed pay was agreed during interview, i was happy with first contract and signed it. However, there was a mistake with the number of hours(just by one hour). So a second one was sent to me. same pay, just one hour per week more...although sent by recorded delivery, got an other contract, a couple of weeks later with post it on it, saying:could u please sign this third contract as second one was not received? so i did, straight away, expecting it to be a duplicate...i was shocked when received my pay sleep a few weeks later so when came back to my third contract, realised the one thousand pounds a year difference between the first and third contract...but according to hr and manager, the third one is correct...what are my rights? how do i respond to that? Please, need ur advice, I am gutted!!