Cancel First for Women insurance

I am trying to get hold of First For Women insurance re. cancellation of my current cover. Both the amounts that was deducted from my account on 28 February is unauthorised as the amounts are incorrect. I want to cancel my cover for both car and home insurance but I am unable to contact them telephonically. After 10 minutes on the line to Auto & General who put me through to First for Women, I spoke to a man. After giving him my ID number, the line was cut and now the phone does not ring at all when I phone back. It shows ringing on my phone but there is no ring tone. I need to cancel ALL THE INSURANCE AND COVER with First for women immediately as I cannot afford these type of theft from my account.