Signal

I have complained numerous times about the signal at home had a guy come out and he promised to get back to me regarding my signal and has yet to respond after my call and sms. I explained that I cant have EDGE running on my phone as this is not sufficient for my line of work I need faster internet speeds. Why do sales consultants sell customers phones with LTE and HSDPA but hardly get signal to run these data types? I had the same problem at work so for my entire contract I've been getting poor signal. AND PLEASE DON'T ADVISE ME TO SWITCH BETWEEN NETWORK TYPES AS I DON'T HAVE TIME FOR THIS!!! I WANT FASTER RELIABLE INTERNET HENCE MY SWITCH TO VODACOM!!!