Nightmare- old mutual

IV taken out a retirement annuity and investment policy with old mutual from last year. Recently have adjusted my premium to adapt to a prospective new salary, which resulted in R1000 less on my premium. Two months after the changes I was still charged the initial premium. My last incorrect premium was in December 2018. A refund was issued in January 2019 and still in March 2019 I have received nothing. The lack of professionalism and communication is astounding. IV requested a new consultant through the call centre and till today no one has contacted......an absolute nightmare of a company to work with.