GL Attorneys not listening

I am not a client. I do not have outstanding debt. I got a new cell number last month and since then I have been bombarded with sms's about outstanding debt not being paid. I phoned and emailed them. Gave them my details where they confirmed I do not owe any outstanding funds and they will remove my telephone number from their database but I still get those annoying sms's. I dont know how to get my number removed from all the places where my number seems to be loaded as outstanding. The previous owner of this number owes a lot of people.