Supose you get an SMS, saying "Your invoice is overdue". You recipient will only see that "an" invoice is overdue, coming from a number like 8686. Remember that shortcodes like 8686 are shared with multiple companies, so this number is not unique to you and thus will not identify you.
It would be better if the message said "Your telenet invoice is overdue". This will be much more clear to the recipient, but will also increase your succes ratio.