Billed for wrong amount

I recently downgraded my account from a 10Mbps line to a 4Mbps line which should have seen the monthly bill go down. I notified Telkom end of February with the changes taking affect the 1st of April.<br> When I received my Bill however it still reflected the wrong invoice amount for April. The price reduction was only done from May onwards.<br> So my line speed was reduced to 4Mbps but they charged me the price of 10Mbps.<br> I tried logging a complaint twice from the online portal but none of these were met with feedback.<br> I complained on twitter as well with the twitter team at Telkom mentioning that someone would be in touch shortly.<br> a week later I asked them for feedback and they said they have escalated the issue.... Getting the idea that my idea and theirs differ slightly when it comes to escalation...<br> <br> Can I get my refund now please?