Very poor old mutual *********** service

I submitted forms last month to change my banking details for my 3 greenlight policies .first I was told to refill the form which I did .on my next debit order date 1 of my policy was only debited whilst the other 2 nothing .I then received a email stating my payments have not being paid and will be canceled. I phoned on the 3th of June to query it the calm centre agent doesn't know what to do cause she keeps putting me on hold to find out what to do .how do you employ people who cannot assist.i was then told I will be contacted by an administrator which I have not hears of as yet .such a big Insurance company with no support or after sales assistant