Poor management and problem solving

For more than 2 years now my personal Number has been linked to Rand Mutual Assurance Umhlanga as part of their call center. After repeated requests emails and promises from them and visits to the branch my number is still connected and people are still calling me continuously. this number has been mine for over 5 year I have had enough. my number does get removed and with in 2 days the calls start again. People are Calling me regarding their personal Trauma at all times of the day and night and I have to explain to them how to get hold of your company this is not on. it makes my life hell and the clients who are trying to get hold of you during their trauma are now delayed and also getting frustrated with trying to get hold of you, some people have also been highly rude to me when I am trying to explain the situation to them. This needs to be sorted out once and for all, otherwise I think I should take this further with legal action.