IFWA-40 Replaced WF720

I received from AT&T an IFWA-40 to replace my 3g WF720 in January 2022.  The only way to get it working was to take it to the local AT&T store for activation.  I retained my old number, but also received another number which I was told was assigned to the unit.  Now, I am being charged for hotspot internet which I do not want.  I have received refunds for this service 2 months in a row.  I only want the wireless home phone service.  The first month I called I was told it would be taken care of.  The next month I was billed again.  This time I was told I was sent the wrong device (not so).  Also, I was told I would have to find a device I could use.  I am to send this device (IFWA-40) back..

Is there any number I can call with knowledgeable people who can resolve this problem?