Earlier quoted context omitted.
"Not supported" is an acceptable first half of a response, but all you really have to add is "I'll pass this on to the tech team" and the tone changes entirely.
But if it's not supported, they can't pass it on to the tech team; that would be against policy. Changing policy to make companies support unsupported software is a hard sell.
"Supported" in this context is clearly "we want more money from your despite you already having paid the agreed amount for this product".