Old mutual failing us clients

I have been calling old mutual to change debit order date, their call center people will tell me it has changed only to be notified of payment going through on the date it previously was debuting, no changes have be done on the debit oder date from last year I called getting different people on call who just confirmed the debit oder changed, but still is bdebiting on the same time. I don't know if it's their trap to find my account with no money and when is time to claim I will be told I skip a month whereas I ve been trying to change date with no access. Calling several times with my airtime and wasting time on a call that won't fix the complaint that I'm raising, is so frustrating. I'm thinking of shopping around and move to the institution where I will be valued whenever I need assistance with policy related issues.. So disappointed in their service.