Dishonesty

I have been paying my policy since 2014, which was a second policy as they cancelled one before by accident and I was told that they wont be able to revive it. I had to take a new policy with less cover and more premium. So later I received a call today letting me know that I owe more than R2000 of missed premium fromJuly 2018 . I asked them why they only called me 2 years later, I dont have email or sms reminding me of missed premiums. According to my bank statement I have paid my premiums the months they mentioned that I did not pay. I have asked them to send me email stating all the months I have missed my premiums I was told to go to their offices. Am really disappointed I feel like its just a way to try to cancell my policy after so many years of paying. I feel am ****med here because they are not telking the truth as I jave my proof.