Allocate my payment to the account pls

I have moved the debit order date since I got a new job and their salary pay date is the 27th.Telkom keep debting on the 25 where as i made an arrangement with them to deduct on the 1st of each month. Transcation keeps failing and will manually deposit the money but for last month the reference number wa cut halfened. I called their help desk 3 times to allocated the money and no one could help. I paid on the 30 May and today we are on the 16.still money is not allocated. This morning again the tried to take double and transcation failed.i sent proof of payment several times to the mailbox but it bounce back as failed. IM TRYING TO REACH OUT TO SOLVE THE PROBLEM BUT NO ONE IS WILLING TO HELP. AND IM PAYING PENALTIES FOR NOTHING. INEED HELP PLS