Final complaint before cancelling

I am having endless problems with the 4mbps uncapped ADSL line that I have with you guys. the internet is so slow (a turtle is much quicker than this) that it takes "hours" before you can search anything on the net and this has been going on now for the last few days and it is only getting worse. Why must I pay a full R599 for a product that you CAN NOT even provide without any problems??? You have 24 hours as of 01/08/2018 to correct all the issues that I am continuously having with your adsl 4mbps uncapped line otherwise you can come and collect your equipment by my gate as I WILL BE CANCELLING and I will demand for a full refund.