Adding users to groups depending on dropdown

groups.php

<?php 

	/*
	*
	*hooking into buddypress's user sgin up to give users roles..
	*
	*/
		add_action('bp_core_signup_user',  'custom_signup', 10, 5);

	public function custom_signup($user_id, $user_login, $user_password, $user_email, $usermeta){
		$getchoice = $usermeta['accounttype'];
		switch ($getchoice){
		    case 'Buyer':

		     	groups_join_group( 2, $user_id );
		     	wp_update_user( array( 'ID' => $user_id, 'role' => 'buyer' ) );

		        break;
		    case 'Seller':

		     	wp_update_user( array( 'ID' => $user_id, 'role' => 'seller' ) );

		     	$testdump = get_user_meta($user_id);

		     	groups_join_group( 1, $user_id );

		        break;

		    case 'Consultants':

		     	wp_update_user( array( 'ID' => $user_id, 'role' => 'advisor' ) );

		     	groups_join_group( 3, $user_id );

		        break;

		}
	}