Galp - oil giant unable to run a simple billing system

The best thing i ever did was rid myself of anything Galp, last year, upon my return i do the customary routine of turning everything on to look for any faults, all was ok except in one apartment the gas stove had no gas, (piped in gas by Galp) i called Galp to enquire, they told me they cut the gas service for ''failure of payment'' every utility bill is paid direct debit by the bank, maybe the bank account is empty, but all the other bills are paid, so i go to the bank, i spend 1 day then another, and another, every invoice the bank received had been paid, i call Galp, i tell them all invoices have been paid, they tell me 9 invoices unpaid, i tell them i don't have any unpaid invoices, turns out they never sent the invoices, they first cut the gas service, send the debt to a collection agency then 3 months later send the 9 invoices, they never apologised, it was my fault i didn't pay unknown invoices, i begged for them to reconnect the service by simply turning a valve but they refused, to reconnect the service involved inspections, fees and more fees, more paperwork, i told them to come and remove the gas meter, they refused and demanded i make a new contract, i told them if they didn't take the meter i would disconnect it and throw it over the balcony into the street, they verbally threatened me with legal action, i told them i had a spanner in my hand and knew how to use it, 2 days later someone collected the meter (my utility meters are inside the apartment) who do these people think they are, i changed to an electric stove and hot water, stuff them all at Galp.