Online shopping

Bought a MTN prepaid MIFI router online. Received it in December and gave all my documentation to the courier for my Rica of sim card as per their SMS received. I have struggle since then to activate the service. I emailed them for a refund they said that I must take it to any MTN store for a refund. I went to the Clearwater Mall branch on the 2nd of January 2023. the lady said that they cannot take it because I bought it online I must take it to the head office on 14th ave. she did activate the card only then and not even the data that I paid for is on the card. I went to the head office on 6 January at 14h00. the security told me that they are closed for the day. I cannot drive up and down every day because they don't know who is doing what in their own business. All i want is my money i paid for and give back the device