from change debit date to threat

I emailed MFC to change debit date and got a call from Ashwika I told her from the beginning of the phone call I am in a hurry please can we try and make this phone call short she didn't acknowledge what I asked, just said she is calling to change my debit date I said yes please she then asked me when am I paying my arrears (December failed I admit that) I said to her I had funds available in January and February ,she then says to me they tried to debit me on the 16th and 25 I said obviously the 16th wont work where must I get those funds on the 16th and I then said 25 I had funds I can show them a statement she says well if you have funds why don't you pay I said to her I expect a double debit things then started getting heated,, instead of me saying but I expect a double debit to go off I said its not my problem if you don't double debit she says, ow so you drive a car but don't pay I said I do pay and I then said I have to go,as I said from the beginning I am in a hurry she still wanted to talk I hung up,she then called back and said ok so she will be sending a agent to my house I asked why she said no you in a hurry goodbye, now what does that mean and is that how you do things