first sms

I received a sms from, lexmed, on the 23rd of june 2015, first sms ever, telling me that i must pay them as my arrangements with them.. never ever have i made arrangments with them, before this date, and all off a sudden i got a sms yesterday stating that they are going to take me to court, and issue summons, if i do not pay them by the 31ste.. what do they think, that i have a mil dollers, waiting for my salary also...