Poor service

A debit order which has gone off for over 12 years, change my debit date in the app and fir the past few months I have had my credit score affected and getting responses such “invalid collection date” , “rejected by your bank” and whatever other reason they can throw back at me. No follow up after 2 people promised to investigate and escalate and my last response was “Siebel confirmed the DO date as updated. In tge meantime I have to do a transfer every month after the stipulated debit order affecting my credit score for the past few months. A contract subscriber for the past 20 years , always paid via debit order , from the same bank and now one task to sort this out on your side and no resolution yet alone feedback. Poor client experience yet I get contacted to sell an upgrade.

No accountability from any person I have engaged with.