Purchased a Sansui BT100x (Bazooka) Bluetooth

Purchased a Sansui BT100x (Bazooka) Bluetooth speaker on december2014). Now trying to purchase the Rechargeable battery that is sold seperate to the unit but no store has stock of this. All stores promises the same thing,Just phoned the westgate branch who also does not have stock and advised me that I won't be able to get one as the new speakers coming out will have built-in batteries. This is unacceptable as I bought the speaker becuase it is portable and would like to get the battery for it. I need Hi Fi Corp to address this matter for me by either sourcing the battery for me so that I can purchase it, or refunding me for the (now) non-portable, speaker system purchased. I believe that the sales person could have informed me of above upon purchase as this would have influenced my decision. Please come back to me with an acceptable resolution to above. <br>