AiwaESTM-100BK, In-Ear Headphones, 3.5 mm Jack, Black

I'm hoping this is just an issue with this one particular set that I received, which is why the overall rating is a 3 - the sound quality and comfort in the ear is great. But for some reason when I put one of the earphones in, it will be okay for 5-20 seconds, then there'll be a sharp, needle-prick type pain against the inside of my ear, where the plastic casing meets the skin, like a prolonged electric shock. I'm not sure it's an issue with the plastic because it seems okay when I wear them with nothing playing, and the feeling gets more and less painful a few moments at a time regardless of whether I'm moving or not. I bought these to replace another set that was doing the same thing but in the other ear, but I know it's not an issue with my ears because I have another set with a similar design that feel fine in the ear, and when I've asked friends they feel it also.Overall the sound is great - brilliant bass and clear sound - and they're comfortable in the ear besides this, but I can't give a great rating because one of the earbuds is effectively unusable because of this. I don't know who to contact for a replacement as this would absolutely be a 5 star pair of earphones if it weren't for this, but I don't want to buy another pair in case this is a common issue.

Value for money product