10? 40? Which is it???!!!!

About 2 months ago i got a call from a Telkom rep asking me if I would like to upgrade my line (from 10Mbps to 40Mbps). After hearing her out, I agreed as the current line wasn't conducive to our usage. I then received some correspondence including a request for a payment for a new router (I figured, faster line faster router required?). I then paid the amount and received the router however after trying to configure the router i called in to the call centre and the technician confirmed that my line was upgraded to a 40Mbps line but the ports or something of that sort wasn't able to accommodate the 40Mbps. Following numerous calls and fault logging (totally hopeless and time consuming!!) I eventually had a technician out to set-up the router and he confirmed that the router was NOT needed as my initial router would have coped fine (thanks for nothing R700 down the drain!). I then received an invoice billing me for the 40 Mbps line when i have NEVER had anything more than 12Mbps for the past month (thank you speedtest)! Firstly... Not paying for the 40Mbps line when I haven't had the liberty of using it. Secondly... Provide me with the damn service you expect me to pay for! Oh and btw, it seems that my profile indicates that i have been upgraded, so all you have to do is actually provide me with the speed I'm paying for!