I used to buy headphones constantly in this store ...

I used to buy headphones constantly in this store and advise this store. In March / April I bought Iphone 6s BU in their store on the Radio Market. The consultants are polite and work well, but I bought, as I realized later, a recessed iPhone (the speaker hissed, almost nothing was heard in the spoken language), although they write in the telegram channel that all the equipment is being tested and works perfectly. after the purchase, he took it back to the service center several times and repaired it free of charge - first, they replaced the speaker, then the earpiece and replaced the microphone (when talking on the phone, the interlocutor hears only noises). and now, a few months later, I again face the problem that my interlocutors do not hear me. in this situation, I myself am also to blame, I had to check it better right away (I think trust and naivety played) and ask to be replaced with another phone.
in this regard, I want to say - before you buy, check more carefully the phones and any equipment, this applies to both employees and buyers