Sold me 4mbps package when 2mbps is max available

I recently requested that my linespeed be upgraded to 4mbps and my data volume upgraded to 20GB. I was assured this was possible and the order was processed.<br> <br> I just learned today, when I transferred my ISP service to MWEB since Telkom is leaving me without service way too often, that according to the line test a higher speed than 2mbps on my line is not possible and they cannot offer me 4mbps.<br> <br> Telkom? How did you sell me something that I am told does not exist and is not possible. You promptly processed my order and I expect to pay for what I signed up for - and now I realise I signed up for a \phantom"service that is not deliverable. Also"