CANCELLED CONTRACT

I cancelled my contract in Nov 2014 and received confirmation that contract will be cancelled on the 14 Dec 2014. I received an invoice in Mar 2015 for this cancelled contract. I sent an email querying this but to date have not received an answer. I also phoned customer service department and when I ask for a detailed account as I have not used this sim card, I was told I should know what I used and just pay the account. In May I sent another email asking them to rectify this or supply my proof. I received the following email \Thank you for bringing this matter to our attention. We apologise for any inconvenience you may have experienced. Your ref number for this query is 698274"this was on the 22 May. On the 25 May I received the following email \""Your service request with ref number 698274 has now been closed.\"" Ok so problem has been sorted out. I then received I final demand on 27 May were I sent another email"