this is my code:

 $customer = CustomerRepository::getInstance()->read($id)->first();
 $contacts = $customer->getContacts();

 $data = $contacts->where('firstname', '=', 'test' )
->orWhere('lastname', '=', 'test2')
    ->orderBy('lastname', 'asc'])->paginate(15);

...

public function getContacts()
{
    return $this->morphToMany(Contact::class, 'contactable');
}

I only want the contacts from the customer which has the certain firstname or lastname , why i get every contact from the Database table?

UPDATE: So i found out, if i delete the orWhere clauses it works, but with the orWhere i get every contact. But how can i do it with the orWhere Clause?