Exness - Refuse to pay my winnings

In December 2019. I have opened 2 short positions on BTCUSD with Exness. There was technical glitch from their side and wrong leverage of 1:200 instead of 1:100 was applied to my account. I was not aware that this wrong leverage was applied to my account, neither they were, because I double checked it with their support during time my positions were opened. I based my risk assessment and stop loss level on Margin shown in my MT4 with leverage 1:100, that was wrong assessment.