How can I record the call? And the finance was with Santander consumer finance

The company he said he was working for is called Anglia UK ltd and he phoned me on his personal mobile as I googled it to find out more information about the company and it shows a lot of his own personal things and forums etc online

I only found out today about the situation as I was driving and had a missed call so I pulled over and rang back to find to my surprise it was a warrant officer, he seemed reasonable at first but I told him I was busy driving back and my phone was low and I'd phone back after I'd spoken to the finance company but they refused to talk and I phoned him back and his attitude changed. Now I said to him I may be able to settle the remaining balance but he said they'd want the car impounded for a week first and that he'd get it out on police ANPR if I didn't to seize and arrest me, due to this threat I've stopped driving on motorways. I've checked my bank and there has been no attempts made to take my monthly payments and I had it setup as a direct debit so there's no reason why the payments could've been missed. Also something that worried me is that he found me on my personal facebook account and was saying I had a picture of the car on it? Not sure why they'd do that..

The total finance is 7300 and the amount paid to my knowledge is around £900 so I'm still quite early in the finance agreement and the finance company won't take my calls so I can't change my address or discuss it directly with them.

Hi guys, I have a car on finance and due to moving I have not been able to get letters for the car and apparently I have missed 2 payments, I had a phone call today from a 'warrant officer' saying the finance want the car back immediately or the full balance and the finance company is failing take my calls. I spoke to the warrant officer and they said if I don't give him the car he would report it stolen to police who would arrest me? He also said I could get up to 7 years for it!! Surely this can't be right.. Also I am not refusing to pay or give the car back as originally he said I have a week but now I don't for some reason and I though a week was reasonable to get it sorted. Any advice much appreciated and if you need any more details pleas let me know.