Terrible communication and customer service

Terrible communication. We have been using sonic telecoms since last year. We then moved end of January this year and had to do a relocation. However, we waited a few weeks for them to eventually come out. Eventually they came to install our WiFi. We then waited another few weeks to get an invoice from them because we had to pay relocation fee. We got two invoices last week and made a payments for both. Now our internet is off since yesterday. We have been trying to contact them via email. We then receive an email stating we haven't paid since February. Bare in mind that we have been waiting almost the whole month of February on them to actually relocate our WiFi to our new address. Then we waited another few weeks for them to send us an invoice to state how much we need to pay with the relocation fee. We emailed them multiple times reminding them to forward our invoice, but we only received them last week and made payments immediately. Now our internet has been off since yesterday. Payment due dates are the 1st of every month. We paid last week, which was before the due date. So they have no reason to switch us off!!