Payment issue and wifi speed issue with Vodacom

Hello all, please note that recently I have had an issue with Vodacom where as I have made payment for my wifi router and they have claimed that no payment was made. I have even asked the agent to submit my receipt as proof however they have failed to acknowledge it. Now my wifi has been cut and I think it is very unprofessional of them as I use this wifi to action work from home. Further to this when taking the wifi we were promised a 25mb line however this has never been the case. The download and upload speed is less then even 1mb at times with is rather disappointing.