Overcharge and Incompetence

On 24 August I sent an email wrg to overcharge, but received no response since then. On 31 August, I called call centre to complain about double charge of handset and admin fee which was not applicable. I was promised that I will be credited, but to my disappointment and disgust there was no credit as promised. For month of September I see another double charge of handset charges. The very same thing happened in July where I was charged for two handsets and an admin fee, but that was credited. No credit was passed in August for handset and admin fee. I upgraded in July and was told that I would only pay for one handset, not they are charging me on a monthly basis for two. There should also be no admin fee as it was online application. Vodacom owes me R910.00 if I had owed them money, they would have charged interest. I demand this money be paid into my account, if not I shall reserve my rights in taking further action as the woman who answered the phone was very rude and abrupt and did not even go into my account to see what is going on. I called a second time on 31.08.2017 and was assisted by a gentleman who assured me I shall be credited, but no credit was passed an another fee of two handsets are being billed for September.