@kidacat, please do let us know how it’s going.
My own husband had a similar thing happen – his parents spelled out for him that they’d pay 100% of his college tuition, so he committed to Northeastern, and then when the tuition bill came they said “oops, we didn’t mean it.” He was already working full time (as a 17-year-old) and expected to cover his other expenses, but that news was a kick in the gut. He chose to take out some loans, continue to work, and live very very cheaply off-campus so he could still attend. It all worked out, but he had to make it happen himself, and it took him several years to pay off his loans after graduation. (Also, that was almost 30 years ago, so tuition wasn’t what it is now).