Telkom Lte cancellation and products

So lets start with that i had telkom uncapped adsl, i currently have 2 cellphone contracts and now recently the Lte service with telkom(24 month contract). So here is my issues. I decided to go the Lte route as they advertise “speeds up to 90mb/sec” which i do understand is restricted to the area you in. So thus i was woww’ed and decided to take up the contract. With this i sent telkom the cancellation documents and that was it, all done. Not quite! 20 December i ran out of data on the router, mind you this was the 400G deal “double up promotion” they had running in October. I thought to my myself 200G can not be finished during a month like December where i was hardly at home. I called telkom, and to my surprise, i was on the 50G daytime deal Which doubles up to 100G a day and not 200G i signed for (i still have the contract ehich proves what i asked for and signed for). I called the offices where i did the initial paperwork(Dsl Telecom) but they were closed. So now i was using data out of bundle as i needed wifi. In a day the bill amounted to R209. Imagine the carnage if i went the full remaining days. So i decided to wait a while and buy data bundles to last the month then call telkom or dsl. Another shocker! On the 26/27 telkom debited R515 for the adsl line i thought i cancelled in October(again i have the email proving it). Another couple of days and a few calls to telkom agents later, i decided to rather cancel the contract as i had enough of people not getting back to me. And guess, its the 16 of jan and i ran out of data again!! I just got off the phone with an agent at dsl telecoms who i forwarded the email and he saw the “mistake” on the contract. I thus called telkom to cancel where an agent there told me the cancellation fees is R799x21 months*(remaining months) which amounts to just over R16000. I need clarity on this telkom, as i did not make the mistake on a signed document, therefore you cancellation fees is unacceptable. The contract that i completed clearly shows i typed 200G and on the form the agent sent me it shows (50G+50G) =100G. So to make that mistake and still charge me over R16000 to rightfully cancel warrants some legal action. All documents we will need is in my possesion. Absolutely horrible