Nectar Premier 13

Hi guys, I bought the Nectar Premier 13 3 days ago and slept on that mattress for 2 nights so far
And…. For petite women like me It’s hard as rock to me.. so at this point
I’m really really suspicious if it will soften up and will get better..
I contacted the customer service and they recommended me to buy a topper
But is it worth spending more money to make it feel comfortable? Or should I just return it and look for the other mattress?