When you getting speed issue check below steps:
1. Check your plan.
2. Check your input link speed.
3. Check ping of your Gateway and DNS.
4. Check with direct connection on PC not on wifi and mobile.
5. Check you device compatibility with your package.(wireless router and PC...)
Check internet speed using LAN to PC or Laptop only, Don't check speed using wifi on mobile and laptop it depends on router performance not on internet speed.
On wifi we will get shared network for that we need to check direct LAN to PC for check speed.