Declined due to being Diabetic

I am a Momentum Insurance client for about 5 years or more.<br> I was disgnoised as diabetic over 2 years now, diabetes well controlled and eating plan with excerise.<br> <br> I gave information from past medical history and was given cover which is current.<br> <br> I app**** to increase cover and was declined by Momentum and I am extremly disappointed as the same medical conditions was used to initially aford me cover and now they declined the increase due to my diabetes???<br> <br> I would like a proper written explaination into this and how this was decided - I understand I will be a risk but to completely decline when the medical conditions were proivided when I took up the cover?<br> <br> Not happy