Calls a couple times a day with no message. Called back and it says Canadian Diabetes Association (Specifically, a male voice says "Canadian Diabetes" and then the default computerized woman's voice says, "At the tone, please leave your message."). CDA has always left messages on our machine before, so I'm not sure why they aren't now (assuming this is actually them).
They call from this number trying to set up a date to pick up used clothing etc. They used to leave voice mails but for some reason can't anymore. This has lead to them just calling more. I called back and asked for them to leave a message with the date of the next pick up and I would leave something out and never heard back from them - but still get calls quite frequently. They always call during weekdays and I have only once been home to take the call.