You’ll likely have heard that marketing should be a mix,  i.e. a 'marketing-mix'. This basically means you shouldn't rely on just one marketing channel such as telemarketing or SEO. Or even referrals, which is the primary channel for most MSPs.

It usually pays to run multiple channels simultaneously, where your prospects can come across your marketing message which not only increases your reach but it reinforces your message within that reach.
That means that someone that’s seen your company via (say) a BNI meeting will hopefully have their perception of your company strengthened if they also see you popping up in LinkedIn (for example) especially if it’s a unified, consistent message.  As a  side note, it’s what makes Google’s Re-Marketing so powerful because it looks like your business advertises everywhere and that you’re bigger than you actually are.