'refer friends to enroll' is this grammatically correct?

I was writing a paragraph for a friend and after finishing, I realized that it doesn't sound quite right. I feel as though there are issues with the grammar.

For example : 'refer friends to enroll'

• the 'friends to enroll' sounds particularly off even though logically it's fine as it's an infinitive verb following a noun.

If you are able to successfully refer friends to enroll in all our Loving Tree English Language courses, both parties will receive a $400 tuition fee waiver. Not to mention, if enrollment in tutorial or preschool classes are successful , the second month tuition fee is half-price.

You can ask people to ‘refer friends to Loving Tree’

Or you could ‘invite them’ to enroll, but you can’t mix the two.

When you ‘refer somebody to something’ it is like referencing something in a library.

• I refer you to section 3, birds and animals
• I am referring to what you said yesterday

You refer someone to something (or someone)

You connect your friends to useful information. But, it is up to them to choose it, or not.

You can’t force people to reference their friends to you, like tickets in a library. You can only ask them to invite their friends to do so.

Also, you might clarify, the second month tuition fee is half-price for whom?

https://www.ldoceonline.com/dictionary/refer-to