Absa Insurance Please stop harassing me!

I have been an ABSA clients for many years. I have indicated numerous times that I prefer not to be contacted via phone and only via sms or e-mail as I am working with clients and not allowed to answer my phone during working hours. I have recently obtained vehicle finance where I have once again indicated that I do not wish to be contacted via phone. Absa is expecting of me to honor my side of the contract that was signed, but they do not honor their side. I have received a call from Absa Insurance where, once again, I informed the consultant that I do not wish to be contacted via phone, but 15 minutes later the ********** number phones my twice!!! This is unacceptable!! As a paying client of Absa I would appreciate my wishes being respected. I have indicated to be contacted via e-mail, but the people from Absa Insurance keeps on phoning me. Please, please do not make me regret financing my vehicle through Absa!