Please don't apologize for getting in touch with such important issues - it's not a problem at all. It's my job to handle this stuff!
January invoice - yes, I got it and passed it on already.
October invoice - I'm sorry, I have no idea what the problem is. I've escalated the problem again, and I'll let you know as soon as I have an answer.
I also have a question for you: What about your keyboard - has it already arrived?
OK, all the best from me for now, I hope to be able to give you some news on the October invoice soon.