Shortly after I joined the bosses decided that we were giving away too much money to the provider, so began talks for an acquisition. The provider was willing, but were asking for much more than we were offering, so the talks fell apart. As such we ended up building our own SMS gateway and switched all our traffic to that - exactly replicating their API, bugs and all, in less than a year.
As we were their main customer they ended up losing 70%+ of their revenue overnight when we switched. A couple of years later we bought them, for much less than we originally offered. Both companies at the time were private companies, but I wouldn't be at all surprised if the same happens here.
