*********** service delivery

I took out a laptop contract with Vodacom and to my dismay I have not received the service that Vodacom promises to their customers. I have been having problems with the modem ever since Iv gotten it. I have called Customer care, chatted to consultants online, and every time they would either 'put a band aid' on the problem or refer me to another department. I have gone to a Vodashop because I have a 2GB data plan and my field of work requires me to be able to communicate via e-mail at all times, do research but by modem DOES NOT allow me to do so. I have tried all avenues and even though my 'LTE' settings have been adjusted/switched on after numerous calls to customer care and trips to the Vodashop, I am only able to genuinely connect to the internet occasionally. The modem would say that I am connected but that would not be the case when I open ANY search engine. I am very frustrated because I have been a loyal Vodacom customer for over 10 years and cannot understand why no one can resolve the problem-I cannot rely on temporary fixes. No one can tell me if I have a faulty modem or what, which I think is pathetic-If not the Vodacom tech experts-who should I turn to?!