Incorrect information

I app**** for phone contract on Monday and I gave a consultant my new number and work address for delivery purposes to my surprise I got an email about dsv to deliver an item at my home address and saying the will contact me on the old cellphone number which is no longer working I lost that number long time ago. Now I phoned dsv to update them with current number and they asked me to call mondo mtn number, where they said they are sending dsv email and I have to keep on checking with dsv as they will be trying to contact me on old number 😭😭😭😢 it is just back and forth I don't if know what to do anymore m panicking. Please help me.