I have the iTunes bill for two ring tones however Apple does not recognize it and asks me to pay for it again. Can someone tell me what sort of malfunction this is?

I need an official to contact me

We are fellow users and these are user forums, you're not talking to iTunes Support nor Apple 'officials' on here.

If you can redownload the tone for free you will be able to do is via Settings > Sounds & Haptics : Use tones and ringtones with your iPhone, iPad, or iPod touch - Apple Support

Redownload previously purchased tones

With iOS 11, you can redownload purchased tones that you bought using your Apple ID.

Go to Settings > Sounds & Haptics, then tap on any sound. At the top of the page, tap Download All Purchased Tones to check for any previously purchased tones not currently downloaded to your device. You might not see this option if you've already redownloaded your purchased tones or if you haven't purchased any tones.

You might not be able to redownload some previously purchased tones.

If you want to contact iTunes Support use the 'Contact Support' link at that top right of every page on here

Same thing just happened to me. I KNOW purchased a song a few months ago and it’s no longer with the rest of my music. I went to iTunes and it’s telling me to purchase it again. I contacted Apple on the phone and they also want me to buy a song I ALREADY bought! Did your issue get solved and how did you solve it?