This is one of the reasons why we recommend having a rotational message or alternate message. Phone carriers screen for spam, and if they see a large number of the same message coming from one phone number, they will flag the number as spam and the messages will not be sent out. 

Also please avoid using these words: Selling, Interested, Purchasing, Owner, If you use these keywords, you will see a negative impact on your deliverability rates and are in great chance of being blocked by the carriers.