Also sorry to hear about a poor experience trying to contact Meraki Sales. But please do private message your contacts and info with @DCooper as suggested, and other comments are correct about leveraging your preferred Cisco partner/reseller. It also depends on which segment/vertical you fall into, and if you'd be handled by an inside versus field team, etc. As an Engineer on the sales side I can tell you we try to be as ultra-responsive as possible, and I won't speak for others, but I hold myself to a pretty strict standard, and always attempt to respond the same day, even if it's only to acknowledge the message and say I'll get back to you. Some days and weeks it's just not possible of course. And I always have someone designated as backup if out for more than a few days. That's all pretty standard practice across Meraki Sales, but with Meraki's awesome growth, there are some occasional scaling issues (growing pains) and I hope that your poor experience was one of those circumstances where someone was just spread too thin or OOO or some combination of things.
Another thought is that if you're a Cisco (not just Cisco Meraki) customer, as a backup you can also of course contact you primary Cisco account team (the AM or SE) as opposed to the Meraki team which may be an overlay/extended team.