Complaint

I called Old Mutual on the 12th of February and asked them to keep my premiums the same as I had not received an increment in 3 years and I was told to write a letter listing all my policy that where going to be affected by these increments, the very same day I wrote the letter and emailed the letter through to them. I then received an acknowledgement letter with a reference from them on the the same day.Only to my surprise Old Mutual sends me a email on 17th March notifying me that my green light police's will be increasing in May so I called on 31 March asking them as to why am I still receiving reminders about increases as I had asked them not to increase my premiums as I wont be able to keep up as my income is the same for the past 3 years.They say I must write another latter , they cant answer as to why the previous letter was not dealt with as I had sent it in advance.