I'm not sure what the free-market theory on that is (it is an interesting topic though) - making a smaller group of customers pay (and have limited alternatives but to pay) to be more competitive in other parts of your market.
The competition commission doesn't have a legal mandate to give preferencial treatment to minorities. They have a very clear mandate and they should stick to it in the interest of seperation of concerns.
The particular minority concerned in this case is a rather wealthy one that benefits from free markets in other respects more than the average person. They don't need extra help from governments.
Helping minorities by fixing individual prices tends to be inflexible because any change in the underlying economics or social culture has to be to be compensated with new regulation which often doesn't happen in a timely fashion.
Preferencial treatment for minorities should, in my view, focus on life and death issues, freedom of expression, legal matters, etc.