This is not an advert sent by or related to Chomp SMS, this a Class 0 message sent to you by your carrier / service provider. They are messages, that typically are not kept, so appear as just a pop-up, like alerts mostly. Spammers are now sending and using this type of SMS message.

To assist on the above either SAVE this message first and then use Chomp's Blocklist feature (long holding this conversation > Blocklist). Alternatively, contact your carrier / service provider to block Class 0 messages sent for you.