Spec savers canal walk

Went in with a voucher to Spec Savers Canal Walk. The voucher was for a pair of Police Sunglasses that a family member had won as part of a golf prize. We went in to the canal walk branch and finally found a pair to the value of our voucher and in doing so ,gave our personal details to the sales lady shakeela . A month or two later,we received an sms saying that we have an outstanding account . What on earth is happening? We are not customers of the store and neither myself or my partner have ever purchased anything at the store other than the pair of sunnies we got in exchange for our voucher. This is not on . We will be taking this matter further if it is not resolved.