Don't phone customer support, phone the main switchboard and ask the name of the person in the relevant department. If you're building a sales tool then ask for the head of sales. Depending on the size of the organisation you might get batted down to a lower level but it's up to you to hustle upwards once you're there. The main thing is if you're looking for validation then get the product in front of the people who will be using it, not their procurement or IT department. Get the target users emotionally engaged and then they will help you run the gauntlet of pricing and tech with the other departments.