Bad Vodacom wifi services

My husband and I have a home router from Vodacom for almost a year now. It worked wonderfully for a few months but for the past 2 months or so, our connection has been very bad. We have been calling vodacom for some time and every time we think the problem is resolved..the connection starts buffering again after a week or so. It is highly unfair that we are expected to pay for a service we only receive for a portion of the month. My husband has called vodacom so many times already, his number is now blocked from calling customer care. So now, not only do we struggle with connection, we need to pay extra for airtime, just to get in touch with customer care. What a service!!! I wouldn't recommend anyone tale out a contract with these guys really. I feel ****med. We can't even get out of the contract because of penalty fees, yet we are expected to pay for sub par services.