Payment plans

I have been going through some struggles money wise and have a outstanding balance I had set up a payment arrangement for the 20th but unbeknownst to me I was auto charged for my smud bill and now I don’t have the money to pay my balance they’ve told me my service would be shut off today I initially didn’t want to do the arrangement I had wanted to set up monthly installments on my bill but accidentally signed up for the wrong payment plan I was wondering if there’s any way to now do monthly payments as I had initially planned because I’m in a bind and have no clue how to move forward now