Vodacom , arrogant, bully , useless and ***********

I ordered an upgrade contract cellphone at the end of May The cancelled it without my concern in June I reapp**** again mid June Phone delivered early July but not working, only switched on once. I called in to have the phone collected and replaced Phone only collected 3 weeks later I called in to cancel the Contract so that I go to another Service Provider Yesterday Vodacom sends me a bill of 3700+, for a contract that does not exist. No phone, no contract, no communication except the bill I want them to send confirmation of cancellation, and refund me the money they stole from my account at the end of July.