No invoice, SMS demand sent to dependent and they wonder why they don't get paid~!

Whomever is hired in the accounts department needs a lesson on how to read instructions! For years I have been not only the main member on the medical aid, but also the person responsible for the account payment which is clearly noted on all forms when completed, the bafoons in the accounts department send SMS payment demands to the dependent and wonder why there is no payment forthcoming. Added to this I have no numerous occasions informed them not only verbally but in writing that should I not receive an account, I will not make payment, something which is totally reasonable given the amount of ********, but do you think they are capable of doing this......... each and every time, I have to send multiple emails requesting the invoice if they desire payment - this will no longer be the case, if they can't get their billing sorted and send the account to the correct individual as per their forms then I will not be kissing their butts to make payment.