Other users have posted complaints on on the Trust Pilot review site.
One said they had lost more than £7,600 on A-level courses.
Another said she had finished all the units of a travel and tourism diploma.
"I am feeling very angry to have come out of this with nothing," she posted.
Her mother Lesley said the company had "railroaded thousands of people's education".
"They've left a lot of children high and dry. What do our children do?
"You've got thousands of children around the country now without tutors.
"They've paid their course fees, they're not going to get that money back," she added.
She said she would receive her money back through section 75 of the Consumer Credit Act as she had paid by credit card, but would have to look for private tutors to take Amelia through the rest of her courses.
The company said it had "tried everything possible" to find a buyer for the business.
"Although the business as a whole could not be saved, several buyers - including Matt Jones - stepped in to preserve as much as possible, safeguarding jobs and allowing continued support for students, many of whom have since received their certificates.
"We deeply regret the impact this will have on our students and staff, which we are trying our best to mitigate.
"We are also truly sorry for the disruption and disappointment this has caused," it added.
In a statement, administrators Forvis Mazars LLP said the company had ceased trading following "significant cash flow pressures" and 11 members of staff had been made redundant.
It said following efforts to find a buyer, the company's assets had been sold to two seperate purchasers.
"One of these purchasers acquired the website, domain names, and the trading style 'Oxbridge'.
"They have agreed to keep the learning portal accessible to students until July 2026; however, no tutoring, marking, or examination services will be provided.
"Due to the substantial level of debt within Oxbridge Ltd, no repayment to unsecured creditors is currently anticipated," it added.
Ofsted confirmed that Oxbridge Home Learning had not applied to be on the voluntary list of accredited online schools.