I flew QR earlier this week and while the cabin crew were excellent there were several things not acceptable which happened to me. The cabin crew told me they would log these after the flight but also that I should contact customer services.

What is the best/most efficient way to contact QR's customer services?

I've flown BA mostly over the past five years and they have offered Avios as ways of compensation. Could someone tell me what Qatar usually offer if they believe some type of compensation is merited?