You did better than me. I simply got a notification to say "your message was deleted without being read"

Suspect this will be the only Keithley product I'll own.
Mind you, my support experiences with Fluke have only been slightly better. They did have the parts I wanted, and at a reasonably price, but wanted to add a massive postage and handling charge that made the job uneconomical. I no longer have that DMM.
I remember that long thread about an Agilent DMM that only reached a satisfactory conclusion because of the embarrassment that was being caused.
It's pretty obvious that all these big companies have had things too easy. By mostly dealing with businesses, the T&M manufacturers have become complacent. Now that enthusiasts and hobbyists are finding the budget to buy decent gear - even if it might only be "entry level" as far as these manufacturers are concerned - they are going to have to get a lot better at dealing with those of us who have limited budgets and some expectation of product longevity and customer service (and blog sites and social media accounts

)
To end on a positive note, my recent experiences with Thurlby Thandar have been really superb. The "big boys" can learn a lot from these guys.