Inconsistent / Illogical e-mail solution

I have had an e-mail alias for the past 15 years, and now require the alias to be linked to another Vodacom number which Vodacom administrators say they cannot do due to security reasons. That is pathetic, makes no sense and is completely illogical. I am so glad I have cancelled my contract with you guys, and now will wait for my second contract to expire so I can cancel as well. You do not seem to understand the impact your terrible service has on customers.