keeps calling then hangs up I call it back and they want to refer me to an agent

I get a call every day for the past three months.  Leaves no message.  Robo call.  Called back and it is a debt collector for American Express Medical (whatever that is).  I told them to stop calling.

Rcv'd 2 calls-left no msg. From reasearch, not a valid caller. Seen as telemarketer, debt collector,etc- DO NOT ANSWER!!!

Additionally-Below is some info I found-FYI

405-896-7030 RESULT FOR THIS TELEPHONE NUMBER
CALLER TYPE
0x Unknown , 0x Marketing call, 0x Harassment calls, 0x Insurance Company, 0x Competition or lottery, 0x Survey, 1x Collection agency, 0x Other, 0x Cost trap, 1x Deceit
RATINGS
0x
Serious
0x
OK
1x
Neutral
1x
KO
0x
Terror
Ratings: 2
Score: 2 (1-5)
INFORMATION
Telephone number405-896-7030 | 4058967030
RegionOklahoma
Dialling code405
International001 4058967030
+1 4058967030
Caller typeCollection agency
RatingsKO
SUMMARY CONCERNING 4058967030
Collection agency=KO
RECOMMENDATION
****THE CALL SHOULD NOT BE ANSWERED!***

They call every day no voicemail but I answered one day and I told them the lady they were reaching out for was the wrong number. They still call EVERY SINGLE DAY! They have since been blocked.