If you ask the security guard, you might as well ask the insurance company directly. The security guard or the bank probably sold the insurance and got the commission. But logically, this is unlikely to happen. . . If that's really the case, you should also consult that bank, because after all, insurance is sold by banks, and I didn't make it clear to you. If the coordination fails, call the banking regulatory bureau to complain and see if the bank will change its attitude. Finally, there is really no way to complain. The bank has monitoring. If the security guard introduces insurance, it may violate some regulations and may be recovered.

If there is such an insurance contract, it may not be completely deceptive, but the business introduced by the bank is not good. Your mother happened to be cheated.