Shocking Tech Support for Cell Signal Issues

I run my business from home as a customer experience manager, & rely heavily on being available for customers to call in on our business number, & to use mobile data during load shedding as well. Recently, we have had major signal strength issues on the Vodacom network (Other phones in the office on other networks have no issue). The signal is often non-existent, & if it wasn't for Wi-Fi calling, we would have been unreachable.

3 times I have logged a call to Vodacom to attend to this. The first time a technician came out, & admitted the signal was low, but said the problem was with my phone & I should get it tested, which I did & there were absolutely no issues. Since then on the last 2 tickets that I have opened in 2 months, as well as following up with them, I have not had a single call from that department, & all I get is an SMS saying the ticket has been closed.

This is incredibly poor service, & I am unable to efficiently run my business because of this.