Paying for a

For the past few months having a problem with the internet switching on and off intermittently and although connected being informed there was no connection . Had malware removed, installed new modem with no improvement. Contacted help desk who informed me I had to get FIVE in the area before they can log a complaint. Stay in Edleen Kempton Park a private residence. Took the computer to an area in Edenvale and immediately e mails which took ages to print or not at all were immediately printed and sent. Even 1km down the road at a shopping centre had reasonable success. Who can I contact to resolve this situation as I am paying for a useless service? Hopefully this email will be received as I am sending same at midnight as this is the forth attempt.