Miway refusing to pay my reward after 3 years with them without a claim

I have been using Miway for the past 3 years. During these years I never had any claim. Last year I added another car for my wife in the same policy. On the 1st Feb I enquired about the reward I was promised that if I spent 3 years without claim I will get. Unfortunately I was told that I do not qualify for the reward. Here is the reason: last year in August our company experienced technical problem with the bank they use. I was supposed to have been paid on the 25 but unfortunately they ended up paying me late on the 27th. When the insurance made deduction on the 27 there was still no money in my account. Immediately realized that my salary has been paid, I call Miway to deduct and they finally run debit on the 30th August. Now when I claim for reward I am being told I have skipped payment. I have tried to explain this to the consultant but my plea fell on deaf ears. I never thought I will find myself having to look for another insurance. I have no choice because I feel cheated. How can they tell me that I skipped payment whereas the payment have been made. This is not a threat, but all I am trying to say is if this issue is not solved amicably this month will be my last with Miway.