Pathetic service and no care for clients

I want to claim my insurance and vodacom refusing to black list my 2nd IMEI number. . Refuse to send an email saying thy cannot blacklist 2nd IMEI number for IPhone . Have been calling for 2 weeks now and i am put pillar to post. I called the client service, visited the branch and sent email till to date no outcome. I am paying my contract every month but they cant give me a simple letter. I am angry and would not recommend vodacom to anyone.