MyWorld Account Rebate Reward

I have been waiting for my reward since 19 September, I have phoned, emailed, contacted them on Facebook. Every time I heard it has been escalated or 7 days, or 48 hours. I have had no joy since I have joined this bank and will be closing my account at the end of this month. It has been a struggle, they either drop the calls, don't respond, escalate or we cannot get a hold of a supervisor. Endless calls and follow ups have been made but my issue has not been resolved.