For the recent past days, the standard bank sent me sms to state that they are closing down my account

For the recent past days, the standard bank sent me sms to state that they are closing down my account. The problem is that I'm don't have a bank account with them. I don't know where they get my phone number to send me sms like that. Standard bank, please do me a favor if people open accounts with you. Ask them if the phone number belongs to them or someone else. Do your job properly, please