Unwanted cellphone contract

On the 05 April 2023, I was called by am agent from Blue dot on behalf of mtn offering a cellphone contract, I refused as I have a new contract with mtn. Shortly after the call I received sms's that an order was created . This will lower my credit score, how will you fix it because of your agents...

Please see below received message.

"Yello Customer!! Your Order has been Created with Order Ref no: ***. Thank you for using MTN"

My I.D is *** Call me on. ***