conditional acceptance is not complying.
You are just offer your OWN rules, your own terms that they cannot accept.
If they do not reply to your conditional acceptance, again is tacit acceptance, so you win

Maxims of LawMaxims of Law

Consensus facit legem. 

Consent makes the law. A contract is a law between the parties, which can acquire force only by consent.

Qui tacet consentire videtur. 

A party who is silent appears to consent.

Non videntur qui errant consentire. 

He who errs is not considered as consenting.

Disparata non debent jungi. 

Unequal things ought not to be joined..

Ei incumbit probatio qui dicit, non qui negat. 

The burden of the proof lies upon him who affirms, not he who denies.

Incerta pro nullis habentur. 

Things uncertain are considered as nothing.

Falsus in uno, falsus in omnibus. 

False in one thing, false in everything.

Quaelibet jurisdictio cancellos suos habet. 

Every jurisdiction has its boundaries.