Unfair Blacklisting

I am not happy with the unfair treatment without even direct communication. I am an owner of a bottle Store.When I purchased the bottle store as I am a business man i hired a manager to run the bottle store – however he is now late-However when he was in charge the deceased committed fraud using the machine, which was never told until the Ikhoka machine was blocked. I tried to engage Ikhokha however I was told have advised that Mastercard blocked and blacklisted me and I have to engage you, I have been sending emails with no response. It should be noted that i purchased the bottle store from the now deceased, and have discovered that he was under investigation for Fraud with the speed point machinery as well only upon his death. I am is not guilty of fraud and we hereby request that I must not be blocked from the use of Mastercard and or any speed point application as same is prejudicing me.