Rakerebate reduced my rakeback

[Sura]

I signed up with rakerebate because of the rakeback deal they offer on rakebacknetwork.com: redninespoker up to 65%.
So I started off with 50% rakeback for the first four days and today they wrote me an email that prima changed their regulations and that I will only get 30%.

">> Because of the new rules at Prima we can only offer 30% since that is the
>> cap.
>>
>> Kind regards
>> Mikaela Edestav
>> RakeRebate.net"


I am a high volume player and would get 60% with the deal they still offer at their own website (rakerebate.net)and at rakebacknetwork.com.
They are breaking the deal I signed up for. Thats a total scam.

Is there anything I can do?