THE WORST SUPPORT SERVICE EVER

I Have had numerous issues with my internet and with numerous occassions have I had to fight to get my internet up and running and then i get told my inter works up to 4mb's and they dont guarantee 4mb's speed and now my line is dropped to 300kbps and i have complained twice I need some one to call me so that we can make other arrangements, and no response, Mweb is one of the most well known ISP's but they give such a ****py service and then expect you to pay, and if you dont pay they want to cut you off and hand you over for payments, but they expect you to pay for a service that you dont recieve. I have had enough of waiting for responses and them just assisting me. if the service doesnt start improving i will rather just stop dealing with mweb and stop payment on any further more services