Fed up with bad network

Early last year I complained to Vodacom about their bad network/reception in Bordeaux, Randburg. I was told that they'll fix the issue after 6 months and I'm still experiencing the same issue. I work from home, and I need to use the Internet and make/receive calls quite alot and this is huge problem for me. Can you please sort this mess out! Your charges are ridiculous for me to be experiencing this! Sometimes I miss important calls because there is no network/reception.