Wrong phones delivered

So after months of trying to get a contract opened up, Vodacom phones my fiance and offers him a deal for two Samsung A21s phones with 2 top up sim cards. Yesterday, they delivered the phones, we open the box and guess what... Wrong phones!! They sent us 2 OPPO A15 phones. Not even the correct brand... So we phone after sales and they tell us that they will do an upliftment within 7-14 days. So, this morning, we start getting sms's to say the sim cards are being activated with these oppo phones. No contact further from Vodacom. This is absolute nonsense. What the hell Vodacom!! Why does the upliftment take so long and why have we not received any communication from you to tell us how this is going to be fixed?? You are ******** people, sending them cheap phones after contract stipulated otherwise. I do not understand how the contract was opened with 1 type of phone and then is registered with something completely differ