Refuse to take product back before my 10 day period

I have renewed my contract from Hillcrest Mtn while on holiday. With no specific fone in mind. I have chosen a Huawei t8. The sales lady didn't explain to me that this device don't have Google on, she ordered the tablet and i received it on the 16 Mei 2021 still she didn't explain to me of the product. I have struggled to get Google on because some of my apps is connected to Google. The next day i went back to the store to to send back the tablet to cancel the contract. The manager didn't want to take back the tablet but she put on Gspace on. I can not us the Gspace as a browser. I went back home from holiday. I phoned her still not happy with the device. I called customer service and they explained that i can still send it back after 10 days if i am not happy. I phoned her back. Still she refuse to take back the tablet. I need a RMI no. from her to cancel the contract when she take the tablet back. I send the tablet to the shop through DHL. I called her to tell her to notify her still se refuse to take back the device. Can someone please help. Im am still in my right to send back the product that im so un happy with. The other sales lady told me that they was suppose to let me know that the product don't have Google.