No credit forthcoming from Cell C in a month

Last month I wrote a report about Cell C charging me twice for Get It on my June account, when I did not subscribe to this service. Their reply to Hello Peter said they couldn't contact me, which is amazing, since I am contracted to their network. I then got a sms with a reference number to say they were investigating the matter. Today I have received my July account and whilst I am no longer being charged for Get It, I haven't received my credit of R103.50. Is my next move to write to the Consumer Protector?