I think you have numerous misconceptions here. You can't pay directly for status. Longevity without change doesn't entitle you to anything. Ten years is not great longevity; try doubling that. Microsoft doesn't not believe you are a "massive spammer"; they are just playing the percentages based on your choice of associations and your choice to abuse their service. Finally, you seem to think you have a contractual relationship with Microsoft that obliges them to accept your email on the basis of "Terms and Conditions" which, if I'm not much mistaken from what you've described, don't apply to your relationship with them.

Your expectations don't match reality and you seem to prefer complaining to change.

I have basically no sympathy at all, I'm afraid. It is your fault, not for "replying to emails" but by failure to update infrastructure as the context changes. This is your problem to fix, and it appears you've made poor choices in that direction based on a misattributed sense of entitlement.