Yes I know it is not law, but the CC processors treat it as law for determining who is right in disputes.
The UCC is not Federal law, it is a complex set of recommendation to States. Although all 50 states have adopted it, each state may modify it. It becomes unenforceable if two states don't have identical provisions. Even under model UCC the seller has the right to make things right and the buyer cannot simply fail to pay for goods not received.
I know how chargebacks work and the dispute process isn't 5-6 weeks, it's much faster. Both sides of the issue, none have taken more than 2 weeks to "resolve" that I've been involved in.
If after a reasonable amount of time has passed and the seller has not received his merchandise, he may dispute the charges to his credit card with his card issuing bank. Normally this process takes about 5-6 weeks. The seller will receive notice of a chargeback and the charge will normally be debited from his merchant account. The seller then has an opportunity to dispute the chargeback.