Absa won't insure my phone

I have a policy with absa idirect insurance, currently it covers my car, I have recently switched to absa insure because they offered me the lowest premium. however when requested to add my cellphone, they insist on getting the proof of payment for the phone. I dont have an invoice made out to me, because the phone was replaced by discovery insure and the invoice was made out to discovery, I just paid the excess. So now im stuck without any cellphone insurance. The call centre agents are not being helpful at all and refuses to help me. Im thinking of closing all my accounts with absa, and move on to a bank that actually values their customers.