My iPhone 6s won’t charge with any charger unless it’s pointed at a certain angle?

i have been trying for a couple of weeks and this is the problem, I have been using a poundland charge☹ And it’s bene working perfeclty fine but when I tried charging my iphone with a different charger, it wouldn’t let me unless I held the charger upwards myself, it’s done this with every other charger I used except my sisters apple charger, but I’m scared if I get an apple charger, which are £20+, it won’t work and itll be a waste of money, I have cleaned the charging port and a lot of lint came out, but it still hasn’t charged my iPhone, help please😅x