Missed Appointment

I was due a visit from an engineer today between 12 and 4, but never heard anything. On checking my letterbox after 5, there was a note to say the engineer had called at 13:20. I have a doorbell that was not rung. I live upstairs, with a door at the top, so I'm unlikely to hear indistinct knocking. I object to being charged £25 when I have been in all day. Plus my intermittent internet is still continuing from at least a month ago. Therefore I require snorher appointment and request that the engineer USES THE DOORBELL. I look forward to hearing from you at your earliest convenience.