Receiving multiple drops after two seconds

Good day<br> <br> I have been receiving multiple calls from different numbers I don't know and when I answer the call lasts for 2 seconds and drops or ends. This started when MTN went on strike. In a day a get more than 7 of such calls.<br> <br> This is very frustrating and irritating to a point that I don't want to answer any calls.<br> <br> I contacted altech autopage a while ago and I was told that an MTN technician will be contacted and the matter will be resolved soon but nothing is happening why? When I call MTN call centre am told am an altech client therefore I should contact altech. What is wrong, what is happening. <br> <br> Please stop this misery.