Failing to deliver

I have a problem with my LTE. The latency is very high at the start of February. Before that it was fine. My latency/Ping is around 300ms average, locally, EVERY DAY. After 11pm my internet is fine, then I get my normal 30ms ping/latency. I have done a trace route and from the 4-5th hop, to a Telkom IP address, the latency is 300ms, from there it just escalates. This LTE promotion deal was great up until this started happening. I am considering cancelling my contract and just going over to ADSL again of maybe a whole other LTE isp. It is just so sad to see Telkom not trying to help me. It's always \We will follow up on the situation\". And they want to keep sending people out to my address which I can assure is not going to help. Everything has been set up correctly, I am not new at this. The LTE worked fine from December up until February. It is a problem somewhere maybe at an exchange or something. This is my last attempt of getting this to work. Please help me, or I am just going to move away."