Oxbridge Academy - Inappropiate service

I started studying in November 2019 with Oxbridge Academy.I called the college after 2 months to ask them to cancel my course as they were sending the wrong assignements with books.Student advisors told me they dont cancel .They made numerous calls to me and send emails .I kept on telling them to cancel .In September 2021 ive been assisted by one of their employees as well as debt collectors to cancel the course which also send me a document to state how much i will be liable to pay after certian months which i must pay the full amount due the fact that it is already too late to cancel