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Help!! My Mom Gave Me 30k To Buy Two iPhone 7 For Her. See Why (Read This Story)

This is what happened to me last sunday, Read below:-

“My Mom asked me how much I bought my iPhone 7, and I said 15,000 naira instead of 350,000 naira, because I don’t want her to start shouting and get angry and complain of how I waste money.

Then she gave me 30,000 naira to buy two for her and her friend.”

 The money is still with me since last sunday, I don’t know what to do 

… What should I do now?