Vodacom being greedy

My husband has a Vodacom contract,signed for R1200 per month.But since January they have been charging us for "content" services.The amount is now R1900!!When I asked for a print out so I can at least see what the content services is that I am paying for,I was told to look on the google playstore app to see what I am subscibed to.There is only an amount of R59 for play music.So where does the rest come from?I was told that as a matter of good will,my account will be charged at R1200 this month-so if they are not guilty of overcharging us for the last couple of months,why make the bill less?I would like a full print out or email to see exactly what I paid for since January 2018,not just "content services" with a huge amount next to it.And I would like them also to refund me,since they can not give me an explanation as to what I am paying for