ABSA promised to call back after waiting for over 30 minutes on the line

I waited 30 minutes to after being transferred to cancel my insurance policy. The guy who eventually took my call indicated that he could not hear me and asked to take my number as the line was not clear. I gave him my number, made sure that he got it right and he read it back to me . He still has not called . Now should I call back and wait another 30 minutes on the line ? Now I will have two companies deducting insurance on my account. I expect better