Telkom is not paying my deposit back?

I just phoned 10210. Had to phone a few times, because I was told to punch in my SA ID number, which I don’t have! Eventually I made one up and that is how I got through. That is complaint number one, but I no longer care that much since I cancelled my contract, specifically because of these kinds of thing that Telkom does. More importantly: I cancelled my line and Telkom sent me a last invoice. I do not contest having to pay that invoice, however, as Telkom is very aware, since it even says on my invoice: that Telkom still owes me R700 that I deposited when I took out the contract. I was now told that I must pay the last invoice and then phone Telkom back to give them my banking details and only then will the R700 be refunded. My outrage: that I have to take that initiative!! Why can I not give her my banking details right now, and Telkom pays me back R700 minus what I owe Telkom??? Or I pay this invoice but then Telkom takes the initiative to email or phone me and ask me for my banking details to refund me??? And a third complaint: I ask the lady at 10210 that I spoke with to log a complaint for me, and she told me to email ********** and I got an autoresponder saying that the mailbox is full!!!