The payment processing fee structure almost incentivizes these customer support nonresponses. If I'm a small company experiencing technical problems with payments, I'm losing ~95% on each error while the payment processor is losing the remaining sliver. For a startup, these sales are critical, but for the payment processor, the fees on these low volume transactions are chump change. I can only hope a bigger customer is experiencing similar issues so the bug fix can be expedited. My only recourses are switching payment processors and generating some bad publicity through a blog post.