Sr Digi School — Not providing textbooks

Sir...
My son studing 5th class at attapur branch. i paid all the fee in last year by managements promise of that we would give text books in free for next year (2021-22 academic year). But now they are saying that pay Rs 5000 as school fee, then only we provide books. is this morally correct? Even i said ok.. i will pay with card. But they are saying.. we dont accepet any cards. Is this fair? very irritating...