Not attending to our slow line speed

We have been very happy Telkom subscribers, in the area we live they are the best when it comes to price and up until recently network speed. Since September however our line is so slow that we cannot stream any movies, at times we're lucky enough to be able to stream a series, and my boyfriend who is an avid Titanfall gamer cannot play his game any more. We logged a call on 26 September complaining about our service. I phone the next week and was told that they have an SLA of 7/9 working days. After the 9 working days the network was intermittently better, but it is still luck of the draw, some days we can't even download pictures on FB. On 17 October I finally received a phone call and unfortunately for the consultant we have been having a bad network week that week. She indicated that they cleared the cache on our tower and asked if it was better, I told her based on the fact that we still cannot stream movies or play games it isn't. She asked me if I did a speed check, I told her that I haven't. She asked me to do so that night and that she would phone me the next day to get the results. I have been doing a speed check every day since then and our download speed ranges from 19 to 27mbps. On 19 October at 8:15 I received a phone call twice which I couldn't immediately answer and then promptly received an email to state that my case is now closed. I phoned them at about 9:30 and told the consultant that I'm highly irate about their service in this matter, which he escalated to his manager but I have still not had any further phone calls. I'm paying for 50G data a month but I am unable to use it for the things I would like to use it for (we've resulted to YouTube clips on my phone).

Not happy at all and feel like we are held ransom since Telkom is the cheapest in our area, Wiru (who is cheaper) doesn't have us in line of sight, Cell C has no network here and Vodacom/MTN you pay through your nose...