XPS 15-9550, replacement battery?

I have had an incredibly frustersting experience trying to order a battery replacement for a 9550. While I have accepted the fact that I will not be getting a warrenty replacement, Dell has refused to actually sell me a battery and is instead stating that the only solution is a Dell battery companion. I now have a machine with an internal battery that will not function and a company that is unable to sell me a replacement. After 4 separate calls and 3 hours being transferred around, I am unsure on how I am able to proceed.