Shocking cusotmer service from Old Mutual

I have through the years experienced nothing but bad service from OM. I had recently submitted a claim, and based on past experience, requested for it to be prioritized in order to have it finalised as soon as possible. This particular type of claim is completed by other financial service providers in 6 to 8 weeks, whereas OM inform me it will take up to 6 months. On following up a week after it having been submitted, I was informed that OM had not even started work on the claim. (that explains why OM takes 6 months) I have now repeatedly attempted to get hold of a manager at OM to raise my concern with the poor service and to ask that the claim be processed. This has been absolutely frustrating. I have sent several emails requesting that a manager phone me but have repeatedly been blocked by Loshire Adams, call centre agent. Her standard response simply continuously refers to OM time standards in which they have to complete the claim. I have for the past 15 to 18 years not placed any new business with OM, purely due to their total lack of customer service. I hope I will now get a response from someone at OM who has the influence and will power to address this putrid situation.