Ackermans Premio phone

I bought a premio X83 as a gift for my sister in the 3rd of April 2021 and the phone has been giving us problems, she took the back for repairs and they gave her an new phone but still the phone keeps on freezing and the battery does not last. We took the phone back for repairs for the second time. Now she has to spend onother 21days without a phone only to experience the same problems.