Bad network service provider

I have a huge problem with this network,I have data plans which includes a router and Sim card.What I've noticed after I used up their data package and then recharge during the month,the network is unusable.It goes to waste,No 5G and really struggling to even maintain atleast 5Mbps on 4G.Whenever I escalate they say refresh and blah blah blah as if I dont know any of those.So every 1 minute I need to restart my device. I can't wait for the contact deals to expire.