Awaiting refund incorrect billing for cancelled contract

<p>Gave notification in Feb 2016 to cancel my contract. Was never actioned until April and was billed incorrectly for 3 weeks in March 16 when i was told it would take 20 working days. Called for refund was told i need to return device. Terrible service no one told me. Returned the device 2 weeks ago to Cedar Square still waiting for refund even though i was charged termination fee. Then was billed in May 2016 for R2000 for no reason! How can you do that i've terminated my contract! urgent reply to this matter or i'm taking it to social media</p>