Impossible to Pay

It seems there is no way you can pay this company, I have a loan with them, I had an issue one month with my salary and the debit order was returned unpaid. I do not want to speak to anyone there they can communicate with email..... but NO but they try phone you every half an hour all day long and fill your mailbox with more unwanted adverti*****ts of products no one wants. Obviously they are a problem, because every number is blocked on Truecaller as a pest / **** but they persist, If there is a number not yet listed on Truecaller and you try phone back, you get the message "the number you have called does not exist, please redial carefully"??????. Just send me an email with my account number and an account number I can transfer money to and there will be no need for me to speak to anyone. Truly one of the most frustrating companies I have ever had to deal with. I do not have time during the day to speak to time wasters.