Debit Order Date

I opened an account with teljoy on which i requested to rent a 50inch TV,i requested debit order date on the 25th on each month.For this first two months my debit order date presummed to be going of correctly.I then requested a washing machine and tumbler dryer set with teljoy to add on, as per this i requested the same date which was the 25th for my debit order to go off my account.From this f,irst month of this debit order never went off on the date i requested and accoring to bank statement went off on the 2nd of each month.I then got call from teljoy saying that i must make payment of outstanding amounts.At the time of the call i advised the consultant tthe reason why debit order are not going throuigh is because i requested my debit order date to be on the 25th or each month,and not the 2nd of each month. 3 months and my request had not being action,now i am listedwith credit for their negligence and have to pay a big amount to get my account up to date for their mistake.I have on numerous occasion spoke to consultants requesting be date of debit to be the 25th but no action was done resulting mygetiing a bad credit profile.I am uterly disgusted ,and demand the right process