unacceptable cellular Internet speed

I have continuously received unacceptable Internet download and upload speeds. I have spoken to multiple technical support staff who all give different advice and reasons for the issue without resolving my problem. Every speed test I do comes out at about 0.1 Mbps. I can barely load a page without the browser timing out. This is across all my various apps. I have tried all variations of changed settings, rebooting devices, trying different devices and still the same issue. This leads me to believe that the cellc network is over congested and cannot service the needs of its customers based on their infrastructure. Either this needs to be resolved or cancel my contract and let a competitor receive my ongoing business and support.