The contact centre is shockingly bad

I have tried in vain to change my address on the momentum systems. I sent my proof of address to make a change to my address and they asked me to provide my contract number and ID to confirm and verify my account with them, which I accept.

However, upon sending them my ID they sent me my statements of account? Why would I need accounts when I asked for my address to be updated. I asked them again only to be told my address is updated when it is clearly not because I can see online is has not been updated. I am now being asked to confirm my old address when I have clearly ask for my addresses to be changed.

The contact centre is absolutely useless and they have no way of following a thread of communication and each time it is new person replying to your email and asking the same questions and not actioning a simple request.