Never contact Customers back

I phoned Miway on 26/01/2018 (10:04) to cancel my insurance, The department which the lady put me through told me the lines are all busy she will get them to phone me back. I received an SMS saying they will phone me back. I phoned Miway again on Tuesday 30/01 their lines were STILL busy, i told the customer care consultant if they dont phone me back i will simply stop the debit order. The date is 31/01/2018 12:45 still no phone call from Miway. Shows you how important the customers really are WHICH PAY THEIR SALARY at the end of the month. In my industry "CUSTOMER IS KING" wish MIWAY would think the same.