Hi,
Its better to mention the item no. with such postings. I think the item no. in this case is 9703474813.
Normally you have to assign the functions for the buttons which I trust you have done. If the product is not functioning properly then you can contact the seller. The seller has good feedback rating and hope he / she will cooperate with you in resolving the dispute.
If the seller does not cooperate then you can open a Dispute of Item Significantly Not as Described type. Hope that won't be necessary.
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Best Regards
😄
Swarup
Kolkata

.
Best Regards
😄
Swarup
Kolkata
