terrible data service

Data number *** ID *** Having a data account of 20GB on which we pay more than R500 per month. since the beginning of January our connection is SUPER slow or not existing!! I reported it, phoned them about 15 times,send emails in which they ask to report it directly to the coverage section. They also gave me a cell number. I phoned them and they wanted me to connect to my computer to test!!! HOW THE HELL WAS I SUPPOSE TO CONNECT WITHOUT INTERNET CONNECTION!!!!! She the said sorry she cant help me. I need an answer to how are you going to solve this problem, or cancel my contract immediately without any costs to me, as we struggle endlessly with the service. I am at the school in the morning and will only be available after 3 in the afternoon. please contact me urgently ***. alternatively my husband, THEO KLEINHANS on ***. AND DONT TELL ME HE IS NOT THE SUBSCRIBER. WE BOTH USE THIS SERVICE!!