Not adhering to promotion

I would like to lock complain. I took out contract with samsung on 13 february 2022 with promotion of tablet wich i was succesfull with. Since 22 february i communicated with them on email and telephonic. Everytime i will be assured that gigt are on the way with 3 to 5 working days. It became later 7 to 10 working days. On 4 march i phoned again and i was said that promotion ended on 28 february so it wil be shirtly that i will receive the tablet. Since 25 march i phoned with no response from them . I also sent email also no response. I do not know what else to do. Thanking you