I have been getting index options exchange fees from IB in my activity statements (under "unbundled commissions" which is a misnomer) over the last month. They amount to about $.50 per option contract, which is something shocking. Have you been getting the same with your broker?
Have you considered trading with another broker? Let me tell you I've been doing it with Tradeview and so far I don't have any complain about spreads or fees.
Everyone pays exchange fees. The only difference is that some brokers charge them separately, while others have them incorporated in commissions. If you have been trading index options for a while and they have just now started charging you these then ask them about this.