Help!!

[Hhhh4]

Hi I am hoping someone can help. So I rented a shop over 10 years ago with a flat upstairs. The flat was sub let. We then this year received an enforcement notice from Newlyn. This was last March. Then COVID-19 happened my husband got made redundant I forgot all about it. The in September time we got a knock on the door from a very obnoxious bailiff saying you have to pay £1600 now. I said well I haven’t got that an was about to take my children to school. He the said is that tour car I said no my husbands he said I have a debt for him too for this house. Absolute nonsense then he got on his iPad and tried to find a debt for my husband. Then he clamped the car and said he would take £700. He got no where and went away whilst shouting that I was being filmed. My husband then called him and said you have 1 hour to remove the clamp as I will remove it. He never came back. I have had a couple of text messages and one letter since. Today I had another visitor I was upstairs so I just didn’t open the door. He shouted through the letter box that he had seen me inside and have filmed me. He left a note to advise he will be back after 24hrs. I have called the council about this who basically said the debt was approx £300 and they didn’t want to money after all these years. Considering we are also in lockdown what should I do??