Poor service and query resolution

Every month I have to phone through to get my tax invoice. This used to be available on your MTN login. In October we upgraded, now this feature is not available with the new contract. I have had to phone through for the last 8 months to get an invoice at the end of each month. They conform my email everytime and say that it will now be sent to me, but never is. The excuse at the end of the year was because we upgraded, in January and February the excuse was because of the load shedding that the system lost the information, in March I spoke to the manager and they said they would personally deal with it and today the excuse was that it takes 30 days to update these types of requests.

I asked who I can talk to because I can't be expected to phone through every month and no one can tell me. After 8 months, I think this should have been resolved!