Online upgrades ********

I upgraded my cell phone contract online and they sent me the wrong phone. I specifically requested the Samsung SE21 and not the FE. However, they sent me the Samsung S21FE. I went the following day to return the unopened phone and requested a cancellation of the contract. I waited almost 2 months for that process to be completed and finally got the contract cancelled. This month they deducted over R16 000 for cancellation fees and VAT. This is outrageous. Please help. I have been a loyal customer of MTN for years.