Damaged goods and bad service

In oct/nov we bought a secondhand tablet. Firstly they gave the wrong charger so had to drive up and down twice for them to realise they gave us twice the wrong charger then about a month ago the tablet gave us problems did not switch on and it was hot so we decided to take it back for them to do repairs they said 7 to 14 working days okay so after the 7th day we went and with an attitude we were told its only the 7th day we went again a few more times to be given attitude with the same thing its only the however much day then we went back on the 15th day where sarcastically we were told it's only the 15th day and ofcause we got upset because we were not told on a specific day anyway they then said collect it tuesday which we did now its two days later and the tablet does the exact same howthing gets hot and does not switch on. What i would like to know is are we getting another tablet or am i getting my money back and mind you i won't be paying in any differences for another tablet as I've wasted enough petrol driving up and down for ****