Pick n Pay Vodacom Phone Deal Ridiculous Service

Terrible service went bought a phone for my Dad on the 27th July cannot use the phone as his sim was not picking up it is not on a locked network went to check if I must do a sim swop MTN and Telkom said it's the phone that's a problem not my sim . Went up and down to Vodacom to sort out this issue which Pick n Pay should have seen to eventually Pick n Pay organized for Vodacom to come and take in the phone they took it for nearly 2 weeks phone comes back put it on it picks up the sim then goes blank . I'm Fustrated with Pick n Pay at the point they must not take the phone to repair a new phone shouldn't be repaired this is ridiculous it has costed me time off work up and down my Dad does not stay with me so I must still drive to him with all these phone problems he had no phone from July this is ridiculous. I want my money back and if they can't give me my money back like what they said they must write it in black and white so that I can take this matter further.