Extremely bad attitude

Last year my father bought a business and took over all cellular contracts the previous owner had.After filling out all the necessary paperwork (for debit order etc.)the sim would stop working and we had to go into a branch at the end of every month to pay(which we had to do during work hours). After assuring us the problem would be fixed it still kept happening each month.My dad fed up with this being the case for the past 5 months decided to go to the branch to sort everything out as we never got a clear explanation as to why it kept happening. As he was trying to explain the problem the saleswoman (who has \helped"me before with the same enthusiasm as today) kept cutting him off mid sentence and was generally being unhelpful"