Wrong DNS server

Hello,
Cloudflare tells me to replace my DNS servers with the following 2 servers:
ara.ns.cloudflare.com
art.ns.cloudflare.com

But I get an error while updating the servers, because there are 2 others setup:
jerry.ns.cloudflare.com
lina.ns.cloudflare.com

see dig:
dig ns slotnerd.de @ara.ns.cloudflare.com

; <<>> DiG 9.16.1-Ubuntu <<>> ns slotnerd.de @ara.ns.cloudflare.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1892
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;slotnerd.de. IN NS

;; ANSWER SECTION:
slotnerd.de. 86400 IN NS jerry.ns.cloudflare.com.
slotnerd.de. 86400 IN NS lina.ns.cloudflare.com.

Hi @user2973,

This #Tutorials should cover the issue here:

Hello,
unfortunately I can not contact the Cloudflare support, because I have nor paid account.
Can you escalate the problem to the support for me?

thanks
Jochen

You can contact support on the free plan, it might just take a while for a reply.

To contact Cloudflare Customer Support, login & go to https://dash.cloudflare.com/?account=support and select get more help. If you receive an automatic response that does not help you, please reply and indicate you need more help.

thank you