Collection of outstanding payment

I received a call from a collection bureau regarding an outstanding amount on my already cancelled account. I duly contacted the above person on 30th September 2015 regarding this matter. I received a reply advising that I had seven day to pay this amount. I then made an offer to pay this amount over a period of time as being a pensioner, my funds are limited, to which I have still not had the courtesy of a reply.mThe vehicle to which the tracker was fitted was sold in September last year and I had previously advised the company that I wished to cancel the policy in 2013. Unfortunately Iam unable to provide proof as I retired and no longer have access to my old companies email account. It has taken Car Track all this time to now collect the \outstanding"amount. <br> Today (14/10/2015) I received an SMS advising that if the outstanding amount is not paid"