Ask HN: What SaaS business tools are you using that has let you down?

Let's try something new - instead of recommendations, let's hear what SaaS products or tools you're using in your business that have disappointed you and your team. In my experience most SaaS tools always pitch a great game, but after the integrations been done and your business grows you often find out shortcomings that aren't advertised on the tin. Let's hear about them!