CSA took money having never contacted me

I split up from my wife in January 2022 ,she made it clear she wanted no contact with me and said if did contact or she would go to the police and say I was harassing her. I respected this. I attempted to resolve financial matters through my family solicitor but my wife never responded, including not attending the hearing date for dispute resolution in September, I had myself calculated what maintenance I should pay using the uk.gov calculator and began paying it by postal order as i had no bank details from her, after 3 months and £1500 with no acknowledgment of receipt I stopped. Yesterday I got my payslip and over £1000 had been deducted by the CSA which was most of my disposable income. I now have £500 to live on for 5 weeks after bills. AT no time have I ever been contacted by the CSA is this correct procedure? I dont have an issue paying maintenance but thought I would been contacted?