tired of struggling and spending to much

Me and my boyfriend started smoking twisp a while ago. Since then we had to replace the battery which is fine and after that we changed the qoiel. I bought the whole top piece two weeks ago because mine didnt want to smoke anymore and it was fine for a week. Every second week something needs to be replaced on the twisp and its ending up costing us more than siggarettes. I am always pleased with the survice we get but the product is not so great