No Internet connection for more than 2 weeks

For more than two weeks now we have had either no Internet access or if we do have access the connection was immensely slow, even to such an extent that the session ends in a time out. We run our business from home and this unsatisfactory service influences the productivity and growth of our business. Without Internet access we cannot connect to our clients to receive orders/payments/enquiries. We are utterly frustrated with poor service!