Poor network connectivity (data speeds 1-2 mbs on LTE 4G+)

Have been complaining numerous numerous times in the past, to date still have poor network connectivity. Data speeds 1-2mbs during peak periods. Sim card was synced, network settings updated but problem still persists. PLEASE resolve or cancel my contract with no penalty being imposed. I would rather move to another network in spite of being a customer for over 20 years! I have also asked for a technician to come on site to validate the complaint.... to date no response!