I compared the speeds of my 3 LTE sim cards, Telkom vs Vodacom vs Cell C.
Attached is the comparison:
I had my Telkom contract for less than 10 days through Selldirect, then logged a call to cancel the contract 25 days ago, have not heard from them since.
Are u on Telkom LTE uncapped contract.. You may need to use the external attena to boost your speeds.
Also if u have the Huawei router, use the Toolbox app to set the router to connect to the 2300Mhz band (check in these forums for steps) as that band will provide faster speeds