Help or don't, but don't pretend

I just experienced people who said they "would be willing to help, no matter what" send me to voicemail then text back, I call you back when I get time. Perhaps I am being unrealistic (it's been known to happen) but when you say, "I'll be there for you no matter what" you don't voicemail someone while you are shopping. It makes it very hard to lend credibility to someone when they don't even follow up on their own statements of wanting to help.