Worse Wireless broadband tarrif is a match made in hell with intermittent no network

I recently made my biggest mistake and changed my tariff plan to Wireless broadband cause of the promo that Telkom had for the night surfer 500GB for R50. So l changed my plan after calling the contact centre and nothing was meantioned about issues with change. So after the call I activated it using *180# and bought the night surfer, then my endless problems started my phone would lose internet intermittent, would not stream a file less than 50mb takes 2 to 3 day to download a 125mb file. So my issues with connectivity got worse and worse. Then the night surfer expired, So l thought this is useless and dont need it let me change back to my old tarrif, Then lam told l cannot change my tarrif lam stuck with it. This is the worse tarriff ever and bad service from Telkom as other Service providers have an option that you can change it. This was confirmed by Nonkululeko on live chat 06/04/2018. So this was straight forward to her like tough there is nothing we can do live with it. If this cannot be changed l would rather port to other service providers with good customer care and service options available .