HELP!!!!!!!!!!!!!!!!!!!!!!!!!!

The most frustrating service i have ever encountered My new device was delivered yesterday (27/07/2020) I am currently using a prepaid MTN number the new device came with a contract number i want to continue using my existing number, i was advised to call activation's line to get this done before i call the insurance line to insure the phone . From yesterday to this morning i have probably spoken to 20 different people none if which have been able to help me. I have been given so many different excuses, told to wait for 2 hours NOTHING. The number still has not been loaded and i have still not insured my device. How difficult is this process?????Can someone please assist me to get this done. I was told a supervisor by the name of Sindiswa Mhlongo would help me but nothing still has been done, i just need my existing number loaded this should not be so difficult. MTN this is ridiculous honestly i feel like returning this phone it is more trouble then its worth