broken product-shocking service!!

Just under a year ago my fianc? purchased a Lenovo laptop from game pavilion, from the moment he brought the laptop home it was faulty. the laptop came up with an error and crashed regularly. He took the laptop to game at Watercrest and they repaired it in store, we then took the laptop home and experienced the exact same problem. This time when we went in, the store sent the laptop away for repairs again, it came back still broken. On our third attempt they said they would still not replace it and sent it away for fixing AGAIN!!!! The store promised us that if it broke again they would replace the laptop no questions asked. When we got the laptop back it was still not working and so we took it in for the FOURTH time!!! The staff called the manager who still would not replace the laptop as promised by his staff and wanted to send it away again. This laptop is used for our business and every time it is sent away we are without a laptop for weeks at a time. This service is appalling, a laptop that is faulty straight after purchase should be replaced immediately and not sent for repairs in the first place. Will not be shopping at game in the future!!