Such Arrogant, Useless Service!

If possible, I would give minus star! Trying to cancel a contract that will expire on the 25th of September. I called 3-4 times, I called exactly 30 days before the contract expires. When I asked for a reference number for the cancellation, the lady gave me an attitude and told me "I am telling you it will be cancelled at the end of September". Yet today I receive another invoice. I called twice again today and they keep me waiting and still no progress! Are they trying to force me to stay. What nonsense is this!