Can't send bill but will cut if you don't pay !!

On 17/7 I contacted Vodacom as I had not received my bill via e-mail & was told there is a system problem & they can't systematically send out invoices via e-mail (eBilling). Consultant e-mailed manually & I paid on 20/7. On evening of 17/7 I took out an additional data contract with Vodacom, which was added to my profile. On 5/8 I received a IVR message on my cell saying that if I didn't pay them R118-77, my service would be cancelled. Once again called them to be informed that my account is in arrears with this amount that related to my new data contract. Invoice generated on 18/7, but could not be sent to me due to their eBilling system still not working & this amount wasn't included in my payment of 20/7, hence arrears. Was also told that the system sent out the IVR messages & cancelled arrears services, but due to technical problems, could not send out eBilling invoices & that I would have to call in and request my invoices to be sent manually each month, until they are able to resolve the problem. I am both embarrassed & deeply offended to be told that I am in arrears, as I pride myself in paying all bills ahead of due date. How do I pay if they can't send me a bill ?