Don't know how to manage client's accounts

Worst service ever. since I installed my fibre about two months ago, I organised to do debit order to my account for the fibre but there was no indication from my bank account that debit orders went out to the fibre company. When I email no comes back to me. I also made a call about a week ago and still waiting for the accounts team to come back to me on my account status. Last month they stated I must make payment to the fibre account but I had no invoices from them on what to pay. This is the reason I tried to contact them and with no response. Today they have send me an SMS stating the payment reminder to a bank account I saw the first time today with no invoices or any indication on what I owe. The fibre company that runs the fibre in the area is more reliable with prompt responses on my issues and also tell me whenever there is issues with the fibre in the area.

Now tell me is this how we are suppose to be manage by a company that cannot even communicate properly to their clients?

The SMS I have received today make me feel they arrogantly just send an SMS and you need to guess how much you must pay. I usually budget to do my payments at the end of the month, because most of my income excluding the fuel money is paid and gone by the 2nd of the month. Now my account is in arrears with an amount I have no idea of how much as I still to date haven't received any invoice. It is just to bad that the fibre company that provides my fibre is not my ISP as at least they communicate and sort my issues promptly.