Telkom are croocks

In April 2017 I got contacted from Telkom for the mobile modem and Data (5 gig day and 10 gig night). Product was delivered and the first thing I do was request to stop my spent limit not to go over my cover amount. Invoice came and bill was ridiculous, I open a case to query Ref: ********** 7 and find out that spent limit was never decrease. Now I have to pay for the usage. Upon my further investigation I see the usage are way less then the package and open another case ref: ********** 5. As discussions with the call service agent it seems like I do not have coverage at my location and I was roaming on a different network. My question was before purchasing the product the first thing the agent did was see if I have coverage before we could continue and see said I have. All Call are recorded but investigations are taking forever. So... 1) Telkom sold me a product that never worked. 2) My request over the phone never happen. 3) Im sitting with a device that I cant use. 4) Im still paying for all of this.