Poor service from Miway

I cancelled my policy on 28 May. After numerous calls to Miway and many promises from their call centre staff that I would receive a refund within 7 days of the premium being charged to my bank account on 1 June, I am yet to receive such refund and I am now led to believe that the refund which I am due will not be paid in full for some unknown reason. I believe this is bad service from Miway!!!