MTN Hartebee****rt Dam - terrible service!

Was flabbergasted at the shockingly poor service at the MTN Store, Village Mall, Hartebee****rt Dam. Fixed LTE router Sim card that stopped working. There is a LOT of data that needs to be used up. We're also using it for business so it's a necessity. ZTE Router stopped working exactly a month after it's one year warranty expired. Purchased a new router, started it up...nothing. USSD codes works perfectly, but no data is being sent or received. Phoned 135...not sure how I got to the technical contract department but the gentleman reset the simcard and wait 15 minutes. We did this and was still not working. So we decided to go to the MTN Store in Hartebee****rt...my goodness! Neither gentleman was keen to help. When I asked them to check the sim card as it might have a physical problem on it, hairline crack etc, I get a response that the number is an LTE Fixed router Sim and in what other cellphone did I use it? I explained again that the router had stopped being operational. I had tested the two data sims in the data modems. The gentleman rolls his eyes and says "I asked you whether you used this in another device!"... You asked cellphones not devices. He starts tapping on the dash impatiently, continously rolling his eyes. And then states that the APN changes when you changes devices. I must phone 135 to get technical assistance. His impatience had now escalated extremely... So I asked whether he would prefer that I go to another MTN branch? This set off another eye-rolling and desk tapping session.... I was dumbstruck at their rudeness! I have to enquire why MTN employs these rude ****s and who the manager of the store is? This was disgusting!