@Kim ********
Mmm, strange indeed. What Tony says normaly is right. If the imm. Office is not too far away from y'r house, to be sure I would go again first of september. Do you have a written paper with 1st of october on it ? Because when they DID make a mistake in the return date (Translation 🤷♂️) and you don't have any written proof of the date 1st of october, then you have a problem I guess.