I have been getting download speeds of 4MBps yet I pay for a 30MBps line, Rain sent a technician to come test the router and they then installed an external router which also gave low speeds

I have been getting download speeds of 4MBps yet I pay for a 30MBps line, Rain sent a technician to come test the router and they then installed an external router which also gave low speeds. I asked Rain to cancel my subscription as of 29 Feb 2024 and they cancelled it immediately while I was busy working from home. I called to ask what happened why do I not have coverage and they said someone cancelled my subscription immediately and they can't reinstate it. What ****py service