Urgent line problem

This has been going o for 9 years now . When people try to dial my number they get a server error on their screen I know this as they what's app me or email me to say the same . This is a business line and no body can get through to me not even my own wife who is also on vodacom under the same contract. Dear vodacom you service is absolutely disgusting . I open a ticket and then it gets closed a couple of days later without even one call from your company. I have even had excuses like you cant get hold of me . Yip that is the problem. I have given vodacom networking staff an alternative number which works . However they say I should simply divert my calls to that number at my cost . I pay approx R 1400 per month for a line that does not work . Sick and tired of trying to get you people to resolve a problem on your network. Must I now go legal to resolve this . This is ****ing my business and removing all patience that I used to have