Internet not working

I have gotten a adsl line with Telkom and it has been installed for two weeks now but we only started making use of it in this week as it is a new business. I then informed them that the line is so slow and the lines are very bad so I would need to upgrade the line. They do not offer buyers remorse or allow upgrades without a penalty free of R12000. This is pathetic as it’s not like I’m cancelling or downgrading. Hence I’m very upset for the bad service as their lines are causing issues with my customer service I’m able to offer and now paying for lines that doesn’t work.