Translated from marketdroid: "We want to force lock in customers, or if that is not possible, annoy them to death with nags if they don't extend the contract."
Asking customer who left you for feedback is generally an annoyance to the customer. My personal policy on this kind of thing is to instant spamlist the company doing it.
Or if not possible, at least not respond.
Face it, either your service is not quite necessary, too expensive, not useful enough or you annoyed the customers to death. There might be no way to keep your particular product going because it just might be one of those pointless ideas that seem nifty but there's no market. It might even be the case of insufficient scope as often is with these funny SaaS things.
Framing it as "rejection" is blaming the customer (at least partly) for bad behavior. (to your business) Exactly one of the behaviors described as bad in the post.
A business relationship is not a marriage. You're not being rejected, but just, to put it bluntly, suck or cannot beat the monopoly.