Maintanance loan

I applied for student finance for the 22/23and I declared that I am married from 2022 but my wife lives outside UK. She has never come to uk. Now student finance is asking to give evidence for marital status and my son's birth certificate. And taxable income of my wife. The problem is my wife never went to work and does not have any proof of work. Now student finance stopped me paying finance and is asking me to them back because they said I have been overpaid last year though I applied as a single person. Now I am in a complete mess. Could you please advice me what should I donin this situation? Thank you.