Vodacom vodabucks store ****

I purchased a voucher using a credit card and vodabucks at vodabucks store using my vodacom app on 10 April 2022. I cannot use the voucher code sent by vodacom using the link provided. It is rejected as "sorry this coupon is not applicable to selected products". I called vodacom and I was transferred to vodabucks store on 12 April 2022 and spoke to Wendy with regards to this problem. She said she would call me back after 72 hours and did not do so. I called vodacom several times again today and I was eventually transferred to vodabucks store. I spoke to Mpendulo who said the problem has not been solved until today, more than a week later. Vodabucks store deducted money from my credit card and deducted vodabucks and yet I cannot use the voucher that was sent to me by vodacom.