Since you could try another route, and 'restore' your iDevice using a computer
that has iTunes application in it; that may resolve the fixation your product has
with this alternative music site... If none of the items above were satisfactory:
• Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support
If there is an adware or other content that doesn't want to go away, there are
some things you can do to erase and restore content. The above may fix it.
Without access to a computer running iTunes, you may be able to erase all the
content in the Device using information from this article:
• Erase all content and settings on your iPhone, iPad, iPod touch, or Apple Watch - Apple Support
in top of this web page, it says:
"use the steps below to restore your device to factory settings and remove all settings and information"
Note there is an Activation Lock that may need to be attended to, the details and
links to that topic are within page above. Be sure to attach the Device to its power
supply and expect some time, maybe hours, for the unit to erase contents. If you
erase all your personal data, be sure to read up on how to restore full function after.
There also is some information that may help overall, even though it is not related
to the topic of the four year old thread you originally replied to; your thread was
'branched' from that topic and my reply went along with it.
This has additional info:
• What to do before selling or giving away your iPhone, iPad, or iPod touch - Apple Support
Hopefully you can gain access to your device and restore its function; by reset or
other method. You may also see if an authorized Apple service provider can help.
Depending on your location, region, or country, the availability of service support
and help will vary. The Locate page for Other (asia, etc) can list more countries.
In any event...
Good luck in this matter! 🙂