Contract mix up

Dear Vodacom, I app**** for a contract, your online department sent me the phone and earphones as I requested. However, I wanted the contract to be added to my existing number. Not only did your online department fail to provide me with the correct stuff, you also have been *******ly charging another person who shares the same name as me but a different ID number obviously, not sure how you managed to botch my ID number and bill the wrong person. I have tried phoning your online department..so many times that you have now blocked my cell from calling you. Ive been to Walker drive vodacom/Sunridge vodacom and phoned countless amounts of times to return the phone, yet I am told the phone can only be returned to the online division, so please can you make a plan and contact me urgently?