Overcharge

In November 2017, i received a call from Telkom sales agent. Called about an upgrade to my phone. I upgrade my phone, part of me upgrading as a long standing customer, i was to get 30 Gbs Free. Cost of my new upgrade to be R219.00 . I accepted My phone was activated on the 29th November 2017. In the 1st week of December 2017, i receive my bill for December, which was R339.00 I queried this amount, and they informed me , there is no pro-rata charge on the the device, which means i paid R120 fee for the device for only 2 days. I paid this invoice. Also no 30Gbs was allocated to me In the 1st week of Jan, i receive an invoice for R719.00 an excess of R500 on my contract, even thou i informed Telkom there should be no extra spending limit. I queried this, as it seems i was billed for 3900 MB of data, that is the reason for the increase of R500 I informed them, that i was suppose to recieve 30 Gbs, and there is no way i could have used 30 Gbs + 3900 Mb of data in a single month. A female by the name of Lindiwe said she will email me a billing list, and see how i accumulated the data. Im still waiting on the email, after being informed that they cannot give me a reference number. I contacted Telkom again today, via the chat platform on the website, spoke to Khanyisile Feli. Seems like the person wasnt interested about my complaint and cut communication off from me. Khanyisile Feli informed me that the 30 Gbs was allocated to me, however my monthly Free Me 1Gb has already been used, and the 30 Gb's is still there. Before my Free me 1GB gets depleted, surely the 30 Gb's should be depleted 1st? thats from the 29th November i have NOT been using the 30 gbs. It makes me wonder if Telkom is ever going to resolve this account/billing enquiry. Seems to happen every time i take an upgrade. This is the last upgrade im taking, it seems its best to switch networks.