PROBLEM CLOSING TRACKER ACCOUNT - 30 DAY NOTICE CASH OPTION

On the 25/02/2020 I had given notice to please cancel my subscription (30 Day Notice) - I had paid for my tracking unit and the installation fee - CASH - as I had chosen trackers Cash Option - Client Pays for unit and is on a month to month payment basis with 30 Day Notice of cancellation. I have requested that they send me the last invoice for March and a full detailed ledger since 01 March 2019 - present, so that I can pay it and everything will be closed. They are trying to say now that apparently I'm on a contract and do not want to close my account. PLEASE CLOSE MY ACCOUNT AND CONFIRM THE LAST DATE OF SERVICE.