Rain Bad service

What a poor service, I ordered a Sim in May and it didn't work so I requested a new on the same month and that one worked..i was on an off peak Sim and upgraded in September. I found out now in November that I was paying for the Sim that was not even working, so I was paying double, to my surprise they don't even see that what they did was wrong instead they put the blame on me for not requesting a cancelation, don't u think they should have canceled immediately when I said the Sim is not working and when the second Sim was delivered the guy told me that they will not take the old Sim and I should trow it away, am so disappointed as am paying +-R80p for a R500 subscription