Incomplete /Incorrect Information

I am angry at the type of service you guys have given to me i called in towards end of April to change my debit order date to be on the 1st of the month starting from June and i was informed all is done to my surprise my service was disconnected and when i called in yesterday i was given a lame explanation that my new debit order date will kick in July why was i not informed of that when i made the 1st call .Funny part is on the 25th May i had sufficient funds in my account why was the money not then deducted .I don't have a problem with paying the re connection fee but your incompetence is on another level .