I am being overcharged

I have a cellphone insurance with them.when I lost my first phone it was covered for R5000 then the y replace it with a phone of a value of R2400 I was ok with that. The problem is now since the day I took thatt new phone I am still being charged the same amount for the cover of R5000 of which the phone im using now is of far less in value. I am paying R109 instead of R59.since January im being overcharged. My question is am I covered for R5000 or I am being overcharged. If I am being overcharged I wish to have all my extra money credited back because they kept quiet since they are gaining from this.