REFUSING TO CHANGE MY SUBSCRIPTION FEE

This service provider works with Link layer, i have fibre which I app**** for through linklayer then they said they work with this company, i has expiriencing some problems with my internet i assume it was the internet speed, so the technician advised me to upgradeso that we can check the cause of the problem, i did 2 weeks later i discovered that the internet speed is stil the same the problem is becoming worse instead, i contacted their office asking them to downgrade my service again, i made a first call, sent emails and that the bill came saying my subscription is stil not changed yet, I emailed them and called them no one talked sense to me, i called and called they were just not willing to asist kept asking who did I talk to previously, I have been begging them to change my subscription but they refusing kept on saying they eil fix it, on the other hand their internet sucks, i have been not been able to perform at my work place because of my slow internet. Can you guys fix everything internet speed and change my subscription to where it was in the beginning. Thank you hope to hear from you soon.