@Solla-topee so basically i do the whole setup of pairing between the adapter and the extender. But for some reason after all the leds are on as described on the manual and i get connected to the tplink my whole internet connection drops. The router's leds are all off except the power one and the dsl one. I need to wait fir some time (around 2 minutes) for the connection to get back. When I unplug the tplink set and i get connected to the main router I don't have any problem in my connection. The router I use is one of my local internet providers and I don't think you could make a conclusion if i told you the model name. 

@SaltzyBros_ DSL uses a frequency range where Powerline operates too. So in a house with poor wiring, when phone and power wires are in close proximity to each other, the strong Powerline signal will interfere with the DSL signal.

Modern PLC adapters have a configuration setting for VDSL coexistence. Set this to whichever VDSL frequency range your Internet provider uses. This makes the PLC adapters mask out the DSL frequency ranges, resulting in clean DSL at the expense of a bit of PLC bandwidth.

Simple measures like untangling the phone wires away from power cords will of course also help.

@PeterM. So I figured out that the model of the TL-WPA4220 is V1 and not V4. Also to mention, if im connected to the tplink just for texting and stuff like that, its alright. But, if i start using youtube or discord for example my internet connection drops. 

For the VDSL part, i dont think i can do anything. Another fact, when i first bought the tplink it was working perfectly but after i upgraded my connection from 24 mbps to 50 mbps by the provider then the problem started. Even the providers couldn't do anything. 

Ok i figured it out. Im going to test it and see if my connection is stable.