Problem with 1) new digital acct that AT&T auto paid w/o authorization 2) billing for existing POTS 3) old POTS bill

1. In Feb 2023 I converted one landline and DSL to digital phone and Internet 75.  I have a new account # for this, and billing is correct.  Auto is not set up (I do not use auto pay for security reasons), but yesterday AT&T made an ACH payment (that did I NOT authorize) for the current bill which isn't due until 3/6.  AT&T decided to use the checking acct # that I paid my prior acct with.  I confirmed the account is NOT set up on auto pay, and there is no checking acct# listed.  This appears to be fraud to me. 

2.  The old acct had 2 landlines and the DSL.  The second landline remains in service as a landline.  Nobody at AT&T can help me figure out how to view my bill for this POTS line online.  When I attempt to lookup the account and enter the phone number and billing zip code, an error message appears.  Have tried this MANY times.  It just doesn't work.  I read posts from other users with this same problem.  How can we pay bills if we can't see the bills online?

3.  The old acct is marked as CANCELLED FOR NON-PMT, but I only moved two of the 3 services on the account.  It was NOT cancelled, has always been paid on time, and has a CURRENT balance due.  a) will this be reported as a non-pay to the credit bureaus?  b) I am owed over a 2 week credit on the old account for overlap in service with the new digital account. An overseas rep gave me a credit amount to apply to the bill, but I am unable to confirm this was applied to the account so am hesitant to deduct it from payment.

The overseas call center reps are of no use at all.  They don't understand, they transfer us to incorrect departments, there is so much background noise, and once when I was connected to the wrong dept (in the U.S.), the U.S. person gave me a non-existent phone number of 877-285-0116 to help with the online bill.  The fact that I have been paying AT&T service charges (NOT govt taxes) of over $40/month makes this horrible customer service even more unacceptable. 

How can I speak to someone who understands and can solve these simple issues?

Thank you in advance.