Momentum DenRet - shocking service

My husband passed away 13/05 and I contacted momentum regardinf DenRet widows pension. Feedback was slow. After numerous escalation an employee gave me written confirmation a week ago that my widows pension would be paid today 20 June ( normal pension date). No pension paid. I phoned and another employee was goingbto phone back. End of business day and no call. 2 escalation emails neiter of which have been responded to. My family have been through enough. How do I find someone who knows somethig so that I can find out when this pension will be paid to me please!