Shocking treatment

Discovery Insure suspended my policy due to non payment because they used the incorrect bank account. A few weeks prior I changed to the new bank details on my portal and thought that was then fine. They admitted their mistake and said they will call me back. Now my policy is suspended and they are ignoring my emails and are not calling me back even. I cannot believe this is how they treat their policy holders. Insurance is serious stuff and now I cannot get different insurance due to them suspending my policy due to their mistake.