This is my life right here. I've decided I'm just telling everyone I'm going to Harvard, and they say "really?" And I reply "nah, just kidding, I'm going to Oxford"
The beauty about Ursula is that she held up her part of the bargain, gave Ariel 3 days to kiss the Prince. Nowhere did Ursula say she could not interfere. It reflects how real life contracts work... Student loans for example.