Normalise usage of Model into Model::class strings

app/Mail/OrderRequest.php

@@ -39,11 +39,11 @@ class OrderRequest extends Mailable
 		Config::set('site',$this->service->site);
 
 		switch (get_class($this->service->type)) {
-			case 'App\Models\Service\Broadband':
+			case Service\Broadband::class:
 				$subject = sprintf('Order BROADBAND: %s',$this->service->type->service_address);
 				break;
 
-			case 'App\Models\Service\Phone':
+			case Service\Phone::class:
 				$subject = sprintf('Order PHONE: %s',$this->service->type->service_number);
 				break;