Total lack of urgency

I requested the 17.7 form which was sent to me. My bank then said the DC number on the 17.7 is different from the one I had initially be registered under. I sent the request through on Monday to have this changed and was told it would take 2 - 5 working days. Thing is it wasn't my mistake to begin with why must I wait? Everytime I call I wait up to 30 min to speak to someone and the call cuts. Today was the best one yet "I'll put you though to the person but I'm not sure if they will answer" Its like this matter is not being treated with urgency. I 've always had endless problems with debt busters.