FNB life driving me to an early grave

I signed up for life insurance with FNB and the first year went off great. A month before the anniversary I received updated paperwork with completely wrong figures. It went from R160 a month to R504 with absolutely no correspondence from me or anything changing in my health status. After calling the call center and them changing it back, claiming an IT error, the raised amount went off my bank anyway even with my paperwork stating it should be R160. I called again, they apologized, gave the IT error excuse and refunded me. Come the next month, again the higher amount went off my account. I called yet again, was told I'll receive a refund and that did not happen this time. I had to call again. The consultant could not help me as the system said R504 again on her side and she is not senior enough to see more information. I was transferred only to hold on for 30 minutes and have my call dropped. I tried calling again the next day with a recorded message stating the call center is not available, I can leave a detailed message. I have send an email stating my problem and still waiting feedback. I would please like this problem sorted out once and for all. I cannot be expected to call every single month to ask for my money back.