Samsung buds+ promotion ending 30 Aug 20

On 25 March 20 my new Samsung S20 Ultra was delivered from Vodacom to my home i ordered online. Samsung SA had a campaign that ran till 30 Aug 20 were you can claim for your free Samsung buds+ when registering the new phone. We did so and on 16 May 20 received a confirmation mail from Samsung with reference number for the delivery of the buds+ CITD***. In June 20 we phoned Samsung to hear when the buds+ will arrive and were informed that due to Covid lockdown they have difficulty in delivering so we will be contacted a month later. In Aug 20 we phoned again as lockdown was reduced but same reply from agent. We then wrote a mail in Aug 20 that buds+ were never received. We were notified via email from Samsung shortly thereafter that the purchase of the phone occured after closure of the promotion. We checked again when phone was purchased and do not correspond to their claim. I enquired at Samsung store and showed them the voucher and delivery email from Samsung and they confirmed that i should get the buds+. I request Samsung to look into this as i firmly believe that purchase of the phone in March 20 and registration was as per promotion and should send me the buds+ as advertised.