Help ASAP plz

It now been a while that me and my husband have been struggling to get in contact with Old Mutual group schemes, we keep sending emails, people phone us back and tell us the cant help us they gonna put us through to the right person and that's where is stops, plz can someone from the group scheme department phone us back, we wanna change our banking details and wanna know if old mutual have received our payment, plz ASAP