No wonder I canceled

Absolutely bunch of idiots!!! When I called in to not upgrade my contract at all and cancel it fully moving me to a pre paid. You clearly ignored my request and only changed the one number not both numbers linked under 1 contract. As per the telephone conversation I did state this yet now im faced with another debit order on a Sim card ive not touched in 2 years. Cancel this immediately, if you take my money out of my account through a debit order, I will take legal action against you