Billing 2 for one bin

I noticed that I was being charged more for waist management than my neighbour last year around April, I reported the matter but couldn't get assistance, even went to the offices in June and they referred me to the wrong office, kept calling the call centre with no luck, I wrote a report on City of Tshwane dashboard on my online account, still no one assisted, finally went to the waist management office on the 20th January 2016 and the bin was removed, requested for a refund but till today I haven't been credited, I even filled a form for a bin of which it hasn't been delivered, I'm so frustrated because it seems like I send emails to a pole, the excuse is finance is busy with my account, it's 2 months and nothing has been done, I don't have a bin but I paid for two bins, I want my refund from last year February when the second bin was added onto my account, I have been very patient but I'm now irate