Bad service from Telkom

Good day i had taken ou a 50 mb per second line with telkome and i was getting like 15 mb per second which i was fine with until January it started with problem whe i got signal for like a minute then my signal was lost an i had to restart the router and i email them and this went on for a wile so i did net get help and was still struggling so i reversed my payment after reversing my payment all of the sudden consultants phoned me and arranged for technicians to come to my house then they came and after the technician was i my hou a consultant phoned me and asked me if everything was working and i told her that it was not and i asked for feedback from the technician and she said she doesn't know se wil call me when se heard from the technician then i didn't hear anything from them tem my router ten gave me 2mb per second my February debit order went of an i emailed them and ask what was going on they told me if i paid my arrear amount that everything would be fine so i did pay is and after that my wifi was 4 mb per second i went to the shops twice so tey can help me as i did not get service from the lady on the email and se basically told me there is nothing that she can do so this month my debet order did not go of so i phoned them to find out why not and they said because of my first debt order was reversed so i got the account number and details and i paid my 780 because that is my instalment since it was only for march that they did not take a debit order but then i received a statement saying my outstanding balance is 1778 and my instalment is only 779 so and i only missed one payment since they decided not to take the debit order an my wifi is stil of from Sunday and i phoned 4 times this week and my phone was cut off 3 times an the 4th time i was helped then after that i tried to speak to their technician team te resolve my signal issues and i was cut off again so i am paying 3 monts for nothing and i did not receive proper signal or service so i told them i am cancelling and i was told that i cant because i must still pay them so i am tired of sending email an calling and struggling with signal