Network issues

A month with no proper network. When you call them all they do is ask you 20 questions and must check your devices and switch them on and off and tell you that you need to wait for a while and call them back again and when you call again they tell you to go to the store to check your device you get there and nothing is wrong with device and you are back to square one and it's the same process all over again. I don't know how many calls I've made this month and it still hasn't been fixed. A huge inconvenience because we have deadlines to meet, emails to send and so forth.