Edgars - Pathetic

Around 2 years ago I purchased an item on my account, then not two later I was called on a Saturday afternoon demanding to know when I would pay! They called me again a few days later. I then paid the account and told them to close my account as I don't need this harassment. They were quite abrupt in their response but closed my account. Since then I keep getting sms's about sales and telling me about my so called rewards! How pathetic, the account is closed, so why keep chasing me after dealing with me in such a high handed and unprofessional manner. How can I get them to stop sending me these sms's? I keep blocking the numbers but they keep coming back.