Please cancel LTE contract

I've been trying to cancel my LTE contract for the last year. Initially I was phoned by Mobile Talk and was sold a LTE modem and told that it had 20gigs of data with no mention that 10gigs were in the day and 10 gigs were at night. (When I went to the telkom shop they said it is 3G and not LTE, it was noticeably slower than another LTE pay as you go modem i had.) After the call I went online to Telkom and saw that the contract she was talking about only had 10gigs in the day and I immediately tried to phone but there was no answer, I then found their website and sent an email cancelling the contract because it did not have 20gigs of anytime data. I do have the reference number. I was still sent the modem, and should have rejected it when it was delivered in line with the consumer act. I have since bought a house and i have ADSL installed. 10gigs does not last very long, the new area has both slow ADSL and LTE buffers allot. I'm not sure why Bedfordview still has such bad internet connectivity, but two blocks away I see there is 40mbps VDSL Yay. I have gone into the Telkom shop twice to cancel, i don't have a problem paying a reasonable cancellation fee. Please cancel this asap.