Total disregard for the CPA

In Jan 2018 i purchased the Lenovo i5 for the tygervalley Branch. On the 16 April not even 4 months later I Return the laptop as there was a fault with the Battery. When I handed it in the form said that it would take 21 DAYS!!! Not WORKING DAYS!!! so after 21 days after no communication from the store or the repair centre, the laptop wasn't there, apparently, it was 21 working days. On 21 working days the 15 May 2018 the laptop still wasn't there... So I went back on the 16 May 2018 a full Calender month and still nothing but the Store promised to have it at the store 4 pm, which it was, however, they were in breach of contract as it was 30 days, not 21 days or 21 working days. So I collect the laptop and the battery was replaced, when I get home the Battery is still draining incredibly fast 100 % last 1 hour if I'm lucky.

I take it back on the 18 May 2018, I tell them it still isn't correct, I gave them one days grace and now they wont help so much for that one day grace and being nice to them, they told me that if I want the battery to last I must put it on Long lasting Battery. How does that make sense why buy a brand new laptop and only keep it power save...So the staff told me that they took a look the laptop in store but there is no job number and they won't refund the laptop or send it in repairs because to them there is nothing wrong but even in power save mode 25% only lasts 30 minutes...

My question is where is the customer service and trying to assist the customer as best as possible, so my next action will be going to the CPA because it is within 6 months and im tired of waiting months for a laptop with no success.