Contract useless.

*** cell phone network is have a contract with since December last year from June they didn't debit my contract on the 13th which they didn't do that I had to pay via EFT even last they didn't in the morning I paid via their online portal now they have headed over to nudebt saying that haven't paid my contract for July I have proof of payment to state I have, this so *********** as a company and bull.