Unfair billing and *********** customers service

First of all I have been unfairly charged according to the so called \free Facebook"this month in which my data has been getting depleted while browsing. I topped up this month and was on Megabonus and suffered extra expense while under the perception that my Facebook was free like the month of July. I called called customer service and spoke to Moses who advised me the switch to easychat and told me because I was on Megabonus I was being charged. His demeanor and manner of speaking to me was offensive and definitely far from polite as well as the lack of knowledge of the service was appalling and he didn't take in any of the facts I was telling him about the service. So I switched to easychat to test his theory and I'm still at square 1 being charged for a service that's free and is compatible with my phone (as I had no problem last month) not only did I lose data I was planning on saving"