Very bad service and *********** customer service

This past December on the second year of my contract cellc made an agreement for me to pay my account elier than the set date. I called and arranged that my account should be debited on my the date I set not their assumed date. They went on continue to debited on their date of choice after my arrangements. On my date of payment I paid my account since their debit didn't go through on their date of choice. I had a chat with a consultant in early January how to resolve this matter and on the 12 of January I was asked for a statement so that they can credit the extra charges since I ddnt agree with their early debited date. Instead of crediting me they did the opposite of adding the bill on to my January bill. This guys are so *********** wow I'm just glad that my contracts is ending in April so I can part ways with this guys they treat their customers like trash