Contract end

About 6 months ago i upgrade from a home internet server (telkom) to a LTE line(telkom). The problem i have is that they never stopped the old line, they are billing me for bot lines although i am only using the LTE line. After i saw i am getting 2 bills i phonef and asked them to stop the old line and was told that i can fo it online,i tried but could not get it right, phoned again then they were off line and could not sssist,i recently lodged a dispute (ref: ********** 3)then was told matter will be resolved within 12 work days,gave them 14days,phoned again,was told nobody was busy with it,they will send a email to their manager "donald qaula" and he will asign someone to prrsonaly resolve it in 5 days. Whala its 7 days now and i phoned again,nobody was busy with it,they will send an email to the other manager " gavin strydom" now i am !@#$%&&^%$ fed up , cant see why i must pay R4744 for internet i dont use but the one i do use is payed in full,ja sure cant wait for my contract to end