Rain Billing issue ( overcharged amount)

Been waiting from 2 June 2025 for a response on my billing query. Everytime I follow up I get a new reference number (got 3 reference numbers already) and no actual response to my query. Got a call about two weeks back only to be put on hold and then the call ended without my issue resolved, today is 30 June 2025 and to date the issue still persists yet my debit order will go off tomorrow 1 July 2025, I need a response or call to have this issue resolved.