Hello its me again,

I've been sent a threatening letter from moorcroft saying that they are going to take further action and get doorstop callers round has i have failed to come to an arrangement with regards to payments being made to them. I am at a loss of what to do has the account they are threatening action with has gone to county court and i have a ccj against my name for this and a £5 payment arrangement. I fell behind with 2 payments but then made a payment for £100 but they are now telling me they will only stop action being taken if i pay them £10 a month. Can they do this? and even though its gone to court could i also get a cca sent to myself regarding the debt or is this pointless. Sorry to be a pain.