My download speed is abysmally slow?

I have Windows 7 on a Lenovo ThinkPad
I have Charter
I reset my modem & router, cleared my cache, cookies, & history, ran a malware detection program and cleaned, scanned for viruses and cleaned, used Ccleaner, looked at every online support I could find, but my internet's downoad speed is at.16-.32mbps
What do I do? Who do I call?

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