Re-purchasing phone after refund

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TDF65
Just Moved In

I bought a prepaid Motorola moto e in December, it didn't function upon arrival, was sent back and money refunded. Telus support told me I could repurchase the phone again at the promo price I originally paid. Now support says I can't and I should go to a Telus store and try and negotiate with them. What is your policy on repurchasing the same phone at the original promo price when the phone has been accepted back at Telus and refunded?

Thanks