1.5% weekend fx fee or 2% foreign exchange fee after 500 euro rolling month?

I wonder if the 1.5% weekend fx fee and 2% foreign exchange fee after 500 euro rolling month will combine or not, after I have spent 500 euro? will it be 3.5% if I spent on weekends in foreign currency and have extended 500 euro limit? and how does the rolling month count? Thank you!