Pathetic service trying to migrate

Good day. I am currently on a 10meg unlimited package for r799 a month I have being trying to upgrade since last Wednesday the 07/03/18 which they said was done when I called in on Thursday the 8th I was told they had to cancel the deal because of a system problem n the system was down they could not do it then either so I called in on Friday again cause since Wednesday my internet keeps going down,but on Friday a lady (Siphindle)was loading the deal again and said the system went down as she was doing it and took all my details down and said she would load it and call me back when it comes on again so I got no ph call back.So on Saturday I called in again and finally the lady loaded the deal but now my net is going off even more because when I called back later on Saturday a gentleman explained they loaded the deal but the system is not sinking now it's so 10-20 meg.... So today I'm trying to work from home n the net keeps going down I called the sales again and they said I must speak to tech support which says it has nothing to do with them speak to sales.....SO Now Telkom I am freeken sick and tired of this **** going on n on just trying to migrate to a higher deal which it seems you guys are highly *********** of doing.ive asked to speak to a manger which the agents refuse to let me speak to....Please could a person with some tech savvy and brains call me and sort this **** out !!!!!