Pensioner not been assisted by anyone at MTN

Dear MTN, My dad is a pensioner and tried on numerous occasions to upgrade his contract of which is already long overdue to been upgraded. He has been to a numerous amount of your shops even been called and no one seems to be assisting him. Can you assist me to change his number to prepaid so that I can migrate him to Vodacom so that I can take a contract out for him on my name.