Neotel is charging me for services they never delivered

<p>I had a wifi issue with NEOTEL which took them 8 months to resolve. The wifi account was linked with the landline account and whilst they were resolving the issue with the wifi they blocked the landline services also. when i complained about this they unlock the the landline service for just 1 month and following month they blocked it again. When i called in they told me they made a mistake they were not supposed to unlock it as the accounts a linked. they continued and block the land line and now demanding that i pay for all the time the landline was blocked by them while investigating the fact that i was sold the wifi on no coverage area. I am not happy as they are threatening and forcing me to pay for services I did'nt receive. Please help me I am not liable to pay for service i did'nt receive!</p>