BAD SERVICE

I have received a sms on the 9th of September 2025 that my phone was due for an upgrade and that I must reply "Yes" if somebody can phone me. My upgrade was done on the 9th and I have requested a Galaxy phone. Received a Galaxy Tablet. Trying to get Cell C to sort this and now they inform me that I should go to the branch to sort this. I have not visited a branch to do the upgrade and they are unable to assist me. BAD SERVICE. What should I do to return the tablet and just get the phone I have upgraded to???? can anybody please phone me to sort this???????