WORST SERVICE PROVIDER FOR BUSINESS DEALS!

i have paid up a contract in 2023 where i had my S21 Ultra phone contract on a business deal, in 2025 they decided to debit me 3 times for a contract that is paid up in full, I send numerous emails but nobody replies with an answer as to why & how they are debiting me for an account i no longer have. Each time they debit me the reversal charges & bank charges cost me alot and whats worse is that nobody takes the time to reply to emails to answer me.